On the same Pixel 6 Pro device and at the exact same place and almost same time (at dusk), I took a picture of a building's rooftop using both the Open Camera app and the stock camera app.
<p>It seems like the stock camera app generates non-existent artifacts.
</p>
All 3 embedded pictures also CC0, shot by me.
<a href="//commons.wikimedia.org/wiki/User:Syced" title="User:Syced">Syced</a>
<span class="int-own-work" lang="en">Own work</span>