Can't save changes to any library

Plex Media Server Plex Pass Betas
5

Issue is back. Can’t save any changes to any library. Trying to turn credit detection off for my home movies library. Get changes cannot be saved. Console has this error.

[Req#126b4] Errors in PUT request: Bad Request

400 Bad Request

‘agent’ is missing or invalid ‘language’ is invalid

Any time I save any change to any library that error shows up in the console and the change fails to save.