Ever since the tvOS 15.4 update last Monday....I notice the Apple TV is not properly deinterlacing globally.
I see those "scan lines" in interlaced content, especially when i watch old shows like All in The Family on Amazon prime app, have been slowly watching that series and others the last several months, and never had this issue before.
Channels recorded the last new episode of South Park Wed night, and it was terrible with all the scan lines.
Not just Channels playback i notice the lines, but any streaming app on the Apple TV.
I just posted about this to the Apple Support forums, but, do not expect any helpful replies there, just copy paste generic troubleshooting things that already been done or not relevant.
There is a AppleTV redit page, but it is locked down so only users "with high karma" whatever that means, can post. And google searches on this, only find very old articles. Not sure if anyone else has this issue or not.
There are other "bugs" they seem to have added to this update....
The on screen Siri orb does not auto go away after triggering it.
Prime Video several times now has frozen on a video frame, but audio continues to play, after it plays an add. Can not back out to menu. Have to power cycle the Apple TV.
This seems to be some buggy release by Apple.
I would not recommend updating to it.