I don't know if anyone else has noticed yet, and I haven't done extensive testing either, but when watching YouTube videos on HDR at max resolution (so 1440p), I get green artifacts where I guess there's deep dark or bright whites. I know it's not from the video because I always use the same stock video to check HDR on phones.
I've got the latest update now but haven't tried again.
I've just tried again now and it seems fine. I was watching the top 2 videos that came up when typing 'HDR' on YouTube. Maybe I needed to reboot or so. I don't really watch much HDR content so it's difficult to know if it works or not unless I test it.