It seems that this particular issue is caused by Frosted Acrylic material when viewed under another glass material. Currently, we are testing your file and will get back to you as soon as possible.
You might recall I previously thought this issue was related to the Frosted Acrylic Material bug. However, that specific problem was resolved with the integration of Path Tracing. Your file, unfortunately, is still experiencing this issue, even when using other materials.
We tried to replicate the setup on an empty file, but were unable to replicate it on our end. Since disabling or enabling PT on your file yields the same result
We’ve flagged this as an isolated case and escalated it to our team. While I can’t give you an exact timeframe for a fix, please be assured that our team has thoroughly tested and officially marked this issue for attention.