I seem to have the problem narrowed down to webplayers (using Chrome and Firefox) and Android/ChromeOS apps… using Plex for Windows or the PS5 app there are no problems. Strange… can’t really put my finger behind why this only happens to web based players and players on Android and ChromeOS.
As it seems this problem started to occur after a recent Plex server update, I’ve installed the Plex server version from last october to see if this version doesn’t have this problem.