Direct playback for 4K content stopped working

I’m having trouble watching 4K content on my Samsung Smart TV.
Direct playback stopped working (previously everything played), now it constantly requires video re-encoding.

Disable Bitrate Limiting - On
Allow Direct Play - On
Allow Direct Stream - On
Subtitles - Off

Plex for Samung (5.64.1), Plex Server (1.42.2.10156)

media: H.264, AAC

Plex Media Server.zip (2.0 MB)