I didn’t have this problem with this movie - my files are named how Plex likes, and the new agent matched it correctly for me - but I have had this issue in the past.
I’m not absolutely certain if Plex needs to be stopped before running this update. Can’t hurt.
sqlite3 com.plexapp.plugins.library.db "update metadata_items set added_at=datetime('2020-08-20 12:34:56') where title = 'Ava' and metadata_type = 1;"
This assumes you don’t have other movies named “Ava” exactly.
