<p dir="auto"><strong>Describe the bug</strong></p>
<p dir="auto">I see in (<a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="451003101" data-permission-text="Title is private" data-url="https://github.com/mrdoob/three.js/issues/16639" data-hovercard-type="pull_request" data-hovercard-url="/mrdoob/three.js/pull/16639/hovercard" href="https://github.com/mrdoob/three.js/pull/16639">#16639</a>) that duplicate node names are now appended with <code class="notranslate">_i</code> when using GLTFLoader. I have noticed in my application though that when i use an underscore <code class="notranslate">_</code> in the node name string, the de-duplicated node process is removing them, which is breaking my application.</p>
<p dir="auto"><em><strong>Live example</strong></em><br>
The duplicated node name in the below jsfiddle is <code class="notranslate">cool_box</code></p>
<p dir="auto">Note that the 2nd and 3rd node names are then renamed <code class="notranslate">cool box_1</code> &amp; <code class="notranslate">cool box_2</code> (first underscores removed)<br>
<a href="https://jsfiddle.net/vthyra4c/" rel="nofollow">https://jsfiddle.net/vthyra4c/</a></p>
<p dir="auto"><strong>Expected behavior</strong></p>
<p dir="auto">De-duplicated node names are appended with <code class="notranslate">_i</code> but the rest of the name string should remain intact.</p>
<p dir="auto"><strong>Screenshots</strong></p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://user-images.githubusercontent.com/7398104/101275271-46f7c180-379c-11eb-9ec3-ebfafc7f3f7e.png"><img src="https://user-images.githubusercontent.com/7398104/101275271-46f7c180-379c-11eb-9ec3-ebfafc7f3f7e.png" alt="image" style="max-width: 100%;"></a></p>
<p dir="auto"><strong>Platform:</strong></p>
<ul dir="auto">
<li>Device: Deskto</li>
<li>OS: Linux</li>
<li>Browser: Chrome</li>
<li>Three.js version: r123</li>
</ul>
<p dir="auto">PS. this is one of my first bug reports, let me know if i should have done something differently or included some other helpful info!</p>
<p dir="auto">With logarithmicDepthBuffer enabled sprites are drawn behind things.</p>
<p dir="auto">testcase: <a href="http://jsfiddle.net/Herst/384Q6/" rel="nofollow">http://jsfiddle.net/Herst/384Q6/</a></p>
<p dir="auto">(corrected title and text and added testcase)</p>