Live TV successful transitioned from one program to the next without any actions by me a couple of days ago when I tried it. Windows server 1.25.3.5409 and Plex Web 4.72.1 (through app.plex.tv). Used Firefox browser. WinTV QuadHD PCIe tuner. I launched from Recent Channels (not the guide) if that matters. Note that I only tried this once and I don’t use Plex day to day – using NextPVR/Jellyfin until I’m convinced that Plex is going to be reliable again.
PlexWeb 4.69.1 bundled in the server still has the problem of crapping out after 3 minutes. But 4.72.1 seemed more usable to me.
Update: I tried again with PlexWeb 4.72.1 from the guide this time. When the current show ended, it again successfully transitioned to the next program in the guide without any actions required by the user. I also let the new show go for 10 minutes. So the 3 minute crapout and the show-to-show issues both seem to be fixed for me in PlexWeb 4.72.1