<h3 dir="auto">Bug report</h3>
<p dir="auto">When creating a legend with a pie graph using the <code class="notranslate">GTK3Cairo</code> backend a TypeError is raised. The issue affects <a href="https://pypi.org/project/matplotlib/#history" rel="nofollow">versions</a> 3.0.0rc2, 3.0.0, 3.0.1, 3.0.2 but not 2.2.3. Likewise this exception is not raised with the backend is <code class="notranslate">GTK3Agg</code>.</p>

<p dir="auto"><strong>Code for reproduction</strong></p>

<div class="highlight highlight-source-python notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="import matplotlib
matplotlib.rcParams['backend'] = 'GTK3Cairo'
import matplotlib.pyplot as plt

fig1, ax1 = plt.subplots()
ax1.pie(
	(83, 14, 2),
	colors=(
		(0.75, 0.86, 1.0),
		(0.49, 0.61, 0.73),
		(0.24, 0.36, 0.47)
	)
)
legend_bbox = fig1.legend(['Sample Text'])
legend_bbox.legendPatch.set_linewidth(0)
plt.show()"><pre class="notranslate"><span class="pl-k">import</span> <span class="pl-s1">matplotlib</span>
<span class="pl-s1">matplotlib</span>.<span class="pl-s1">rcParams</span>[<span class="pl-s">'backend'</span>] <span class="pl-c1">=</span> <span class="pl-s">'GTK3Cairo'</span>
<span class="pl-k">import</span> <span class="pl-s1">matplotlib</span>.<span class="pl-s1">pyplot</span> <span class="pl-k">as</span> <span class="pl-s1">plt</span>

<span class="pl-s1">fig1</span>, <span class="pl-s1">ax1</span> <span class="pl-c1">=</span> <span class="pl-s1">plt</span>.<span class="pl-en">subplots</span>()
<span class="pl-s1">ax1</span>.<span class="pl-en">pie</span>(
	(<span class="pl-c1">83</span>, <span class="pl-c1">14</span>, <span class="pl-c1">2</span>),
	<span class="pl-s1">colors</span><span class="pl-c1">=</span>(
		(<span class="pl-c1">0.75</span>, <span class="pl-c1">0.86</span>, <span class="pl-c1">1.0</span>),
		(<span class="pl-c1">0.49</span>, <span class="pl-c1">0.61</span>, <span class="pl-c1">0.73</span>),
		(<span class="pl-c1">0.24</span>, <span class="pl-c1">0.36</span>, <span class="pl-c1">0.47</span>)
	)
)
<span class="pl-s1">legend_bbox</span> <span class="pl-c1">=</span> <span class="pl-s1">fig1</span>.<span class="pl-en">legend</span>([<span class="pl-s">'Sample Text'</span>])
<span class="pl-s1">legend_bbox</span>.<span class="pl-s1">legendPatch</span>.<span class="pl-en">set_linewidth</span>(<span class="pl-c1">0</span>)
<span class="pl-s1">plt</span>.<span class="pl-en">show</span>()</pre></div>
<p dir="auto"><strong>Actual outcome</strong></p>

<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="Traceback (most recent call last):
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py&quot;, line 33, in on_draw_event
    self._render_figure(allocation.width, allocation.height)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py&quot;, line 21, in _render_figure
    self.figure.draw(self._renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/figure.py&quot;, line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/image.py&quot;, line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/legend.py&quot;, line 646, in draw
    self.legendPatch.draw(renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/patches.py&quot;, line 535, in draw
    renderer.draw_path(gc, tpath, affine, rgbFace)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 239, in draw_path
    _append_path(ctx, path, transform, clip)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 163, in _append_path
    return _append_paths(ctx, [path], [transform], clip)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 104, in _append_paths_slow
    *np.concatenate([cur / 3 + points[:2] * 2 / 3,
TypeError: unsupported operand type(s) for /: 'tuple' and 'int'
Traceback (most recent call last):
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py&quot;, line 33, in on_draw_event
    self._render_figure(allocation.width, allocation.height)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py&quot;, line 21, in _render_figure
    self.figure.draw(self._renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/figure.py&quot;, line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/image.py&quot;, line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/legend.py&quot;, line 646, in draw
    self.legendPatch.draw(renderer)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py&quot;, line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/patches.py&quot;, line 535, in draw
    renderer.draw_path(gc, tpath, affine, rgbFace)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 239, in draw_path
    _append_path(ctx, path, transform, clip)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 163, in _append_path
    return _append_paths(ctx, [path], [transform], clip)
  File &quot;&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py&quot;, line 104, in _append_paths_slow
    *np.concatenate([cur / 3 + points[:2] * 2 / 3,
TypeError: unsupported operand type(s) for /: 'tuple' and 'int'
"><pre class="notranslate"><code class="notranslate">Traceback (most recent call last):
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 33, in on_draw_event
    self._render_figure(allocation.width, allocation.height)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 21, in _render_figure
    self.figure.draw(self._renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/figure.py", line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/legend.py", line 646, in draw
    self.legendPatch.draw(renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/patches.py", line 535, in draw
    renderer.draw_path(gc, tpath, affine, rgbFace)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 239, in draw_path
    _append_path(ctx, path, transform, clip)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 163, in _append_path
    return _append_paths(ctx, [path], [transform], clip)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 104, in _append_paths_slow
    *np.concatenate([cur / 3 + points[:2] * 2 / 3,
TypeError: unsupported operand type(s) for /: 'tuple' and 'int'
Traceback (most recent call last):
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 33, in on_draw_event
    self._render_figure(allocation.width, allocation.height)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 21, in _render_figure
    self.figure.draw(self._renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/figure.py", line 1649, in draw
    renderer, self, artists, self.suppressComposite)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/legend.py", line 646, in draw
    self.legendPatch.draw(renderer)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/patches.py", line 535, in draw
    renderer.draw_path(gc, tpath, affine, rgbFace)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 239, in draw_path
    _append_path(ctx, path, transform, clip)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 163, in _append_path
    return _append_paths(ctx, [path], [transform], clip)
  File "&lt;redacted&gt;/.venv/lib/python3.6/site-packages/matplotlib/backends/backend_cairo.py", line 104, in _append_paths_slow
    *np.concatenate([cur / 3 + points[:2] * 2 / 3,
TypeError: unsupported operand type(s) for /: 'tuple' and 'int'

</code></pre></div>
<p dir="auto"><strong>Expected outcome</strong></p>
<p dir="auto">The expected outcome is that a legend with the text "Sample Text" would be displayed and there would be no stack trace.</p>


<p dir="auto"><strong>Matplotlib version</strong></p>

<ul dir="auto">
<li>Operating system: Fedora 28 x64</li>
<li>Matplotlib version: 3.0.2 (Installed from PyPi with PIP)</li>
<li>Matplotlib backend (<code class="notranslate">print(matplotlib.get_backend())</code>): GTK3Cairo</li>
<li>Python version: 3.6</li>
<li>Jupyter version (if applicable): N/A</li>
<li>Other libraries: N/A</li>
</ul>
<p dir="auto">Saving a figure with <code class="notranslate">plt.savefig</code> in <code class="notranslate">svg</code> file format using the <code class="notranslate">cairo</code> backend results in a <code class="notranslate">TypeError</code>. The Traceback is:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/util/plot.py(814)save_and_close_fig()
-&gt; plt.savefig('plot.svg', transparent=True, dpi=800)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/pyplot.py(689)savefig()
-&gt; res = fig.savefig(*args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py(2094)savefig()
-&gt; self.canvas.print_figure(fname, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backend_bases.py(2075)print_figure()
-&gt; **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(569)print_svg()
-&gt; return self._save(fobj, 'svg', *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(622)_save()
-&gt; self.figure.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py(1649)draw()
-&gt; renderer, self, artists, self.suppressComposite)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py(138)_draw_list_compositing_images()
-&gt; a.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axes/_base.py(2628)draw()
-&gt; mimage._draw_list_compositing_images(renderer, self, artists)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py(138)_draw_list_compositing_images()
-&gt; a.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/legend.py(646)draw()
-&gt; self.legendPatch.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/patches.py(535)draw()
-&gt; renderer.draw_path(gc, tpath, affine, rgbFace)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(239)draw_path()
-&gt; _append_path(ctx, path, transform, clip)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(163)_append_path()
-&gt; return _append_paths(ctx, [path], [transform], clip)
&gt; /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(104)_append_paths_slow()
-&gt; *np.concatenate([cur / 3 + points[:2] * 2 / 3,
(Pdb) points[:2]
array([404.72 ,  67.472])
(Pdb) cur
(400.71875, 67.47265625)"><pre class="notranslate"><code class="notranslate">  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/util/plot.py(814)save_and_close_fig()
-&gt; plt.savefig('plot.svg', transparent=True, dpi=800)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/pyplot.py(689)savefig()
-&gt; res = fig.savefig(*args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py(2094)savefig()
-&gt; self.canvas.print_figure(fname, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backend_bases.py(2075)print_figure()
-&gt; **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(569)print_svg()
-&gt; return self._save(fobj, 'svg', *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(622)_save()
-&gt; self.figure.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py(1649)draw()
-&gt; renderer, self, artists, self.suppressComposite)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py(138)_draw_list_compositing_images()
-&gt; a.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axes/_base.py(2628)draw()
-&gt; mimage._draw_list_compositing_images(renderer, self, artists)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py(138)_draw_list_compositing_images()
-&gt; a.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/legend.py(646)draw()
-&gt; self.legendPatch.draw(renderer)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py(50)draw_wrapper()
-&gt; return draw(artist, renderer, *args, **kwargs)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/patches.py(535)draw()
-&gt; renderer.draw_path(gc, tpath, affine, rgbFace)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(239)draw_path()
-&gt; _append_path(ctx, path, transform, clip)
  /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(163)_append_path()
-&gt; return _append_paths(ctx, [path], [transform], clip)
&gt; /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py(104)_append_paths_slow()
-&gt; *np.concatenate([cur / 3 + points[:2] * 2 / 3,
(Pdb) points[:2]
array([404.72 ,  67.472])
(Pdb) cur
(400.71875, 67.47265625)
</code></pre></div>
<p dir="auto">It seams like the value of <code class="notranslate">cur</code> should be an array and not a tuple.</p>
<p dir="auto">The versions of the related programs are:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cairo                     1.14.12              h276e583_5    conda-forge
matplotlib                3.0.2                h8a2030e_0    conda-forge
matplotlib-base           3.0.2            py37h20b835b_0    conda-forge
pycairo                   1.18.0           py37h4d1f301_0    conda-forge
python                    3.7.0                h5001a0f_4    conda-forge"><pre class="notranslate"><code class="notranslate">cairo                     1.14.12              h276e583_5    conda-forge
matplotlib                3.0.2                h8a2030e_0    conda-forge
matplotlib-base           3.0.2            py37h20b835b_0    conda-forge
pycairo                   1.18.0           py37h4d1f301_0    conda-forge
python                    3.7.0                h5001a0f_4    conda-forge
</code></pre></div>
<p dir="auto">The bug occurred at several plots. However, the creation of the plots is rather complex. Thus I have no minimal example that reproduces the bug for now. If this is necessary, however, I can try to construct one.</p>