The bug for this was fixed a long time ago - fixed in 1.13.1
Suggest you ensure debug logging is enabled
Restart the server and then wait 10 minutes and then capture the logs and attach here together with a screenshot of the issue and a screenshot of the server general settings with show advanced to show what update channel is configured
See
https://support.plex.tv/articles/201643703-reporting-issues-with-plex-media-server/
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
