When I change my scanner and agent, perform a plex library upgrade, settings do not save

The DNS issue is the Remote Access failing detection.

I guess with the agent issue you will have to decide are you going to “Plex Dance” individual items or drop a whole library and re-add.

To start you can verify the library agents are properly set and then Plex Dance these two folders which have erroring metadata:

‘Accused 2023’
‘The Walking Dead: Dead City’