Tried right now after reading this (i normally use the old album app from sony cause i don't like google photo app) and my google photo freeze only with 4K HDR video. with 4k only no HDR all work fine.Another to the list (reported in the Sony community too):
Google Photo APP won't play videos.
Trying to open any 4K or HDR video with Google Photos (the default app gallery) makes the app to freeze, and then you can not play any type of video. Solved only by restarting the phone.
No problem with old album app