This is exactly what I’m finding as well. For some reason game motion being on totally fixes the issue but you gain 10ms give or take of input lag. Weirdly, there are some ghosting issues with motion off as well, oddly bright highlights, blown out contrast, etc. I wonder if game mode is really suppose to function with motion processing, they seem to be linked in that way. My big question is: if you run a Xbox or PC through VRR / Freesync outputting 120hz do you also have these weird dimming or contrast issues, or do these not happen because you aren’t touching game mode at all?
I am getting this on my Q90T as well so it has to be a software bug. Any fixes? Factory reset? Wait for another firmware?