Black artifacts in glass material

In the past few weeks I suddenly saw a weird black smudge in the reflections of glass, this would morph if you moved and eventually disappear and reappear

I hoped that it was just my Roblox client acting up but I just received a report from one of the testers of our game ;


And they’re seeing the same.

Extra context:
-Happens in other glass parts too, so it’s nothing depending on what’s behind the glass
-it disappears on lowest graphical settings
-Updating GPU driver changes nothing
-Unified lighting is disabled

Has anyone seen this before & how to solve this?

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Might be because you’re using the Unified Lighting beta

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It’s unchecked in beta features, never used it before