I have Plex installed from my Samsung QLED 2018 app store and it works fine except showing correct clock.
It was pain to set correct clock in my TV settings (thanks Samsung) but I’ve managed it and now I have correct clock everywhere on my TV except Plex where it’s always 7 hours behind. It’s 22:12 in Moscow now and it shows 15:12 in Plex.
I think this player-related bug is old.
Server Version#: 1.16.5.1488
Player Version#: 4.1.1