I noticed that some of my 4K .mkv files are playing correctly, some crash the transcoder or just hang. hen they play it includes Automatic frame rate and dynamic range switching. Things are on their way it seems
It does seem a lot better, but no audio is my main issue right now.
I get audio, just can’t tell you what type at the moment as my apple TV is connected to the TV and I am using ARC from TV to the receiver. This causes issues with some audio formats.