It’s one of the (many) issues being raised repeatedly in the big pinned thread about the update that pushed photon UI from opt-in to opt-out. Fortunately, this does mean you can still opt out of it while it’s not even beta-ready but they’re calling it that while thinking “beta” means “ready to force customers to deal with for long enough to find the opt out screen” for some reason. You might want to add your voice to the (many) others mentioning this problem (and other issues) in that pinned message I mentioned. Which includes other people seeing results which seem to probably be caused by this part of the problem:
I’m inclined to think that flickering is probably the cause of… this:
Not the only post mentioning the new UI causing actual pain in that thread, either.