Here is the project link:
https://projectneo.adobe.com/studio/c0024b47-614b-471d-aec3-a82a8d6514c3
It started by degrading the scene, little by little. The glitches could be seen in exports as well, until at some point it ended up like that:
the "original" was this: Which I had the wisdom to export before it started going awry
I have had numerous display glitches, particularly in "vector" style, but they never shown in export.
In Firefox, but the same in Edge (I don't have Chrome installed)
Let me know if you need anything else.
Thanks!