4K Resolution Suddenly Gone

I updated my Gen1 AppleTV this AM to 15. I started to play back a couple 4K movies such as Prometheus and Home Alone. Both are definitely NOT in 4K. No more film grain on Home Alone, both look fuzzy. Same on the AppleTV app on my TCL Roku TV. The Roku TV has both HDR and Dolby Vision. Nothing has changed. I checked the TV settings on my AppleTV and made sure they were the same (4K 60hz Dolby Vision). 5.1 WiFi strength is excellent. When I watch these titles on my Vudu client on the same tv, they are great. Prometheus is way sharper, and I can see all the film grain on Home Alone. Contrast is also much better. Apple TV and Apple TV app both report that I own these titles in 4K, as does Vudu.

Apple has definitely done something on their end to lower the resolution of these movies. I'll check more titles on my lunch break, but I'm doubting I'll find the situation with them to be any different.