Artwork not being auto-applied anymore

[tom80H]

That’s the version of Plex Web running on Plex Media Server 1.18.3 (from December last year).

Plex Media Server

Plex Media Server 1.18.3.2111 is now available in the Beta update channel NEW: (Dashboard) Add CPU and memory graphs to some new linux-based platforms (#10080) (Library) Don’t add duplicate files to the PlayQueue. This could occur when a single file contains multiple episodes. (#1340) (Library) Track watch status accross multiple episodes when they share the same underlying file. (#1340) (NAS) QNAP packages are now signed. (required for QTS 4.4.0 and newer) (Web) Updated to 4.12.3 FIXES: (…

Updating your server should fix this… see

Important information regarding TV artwork in Plex

On January 31, 2020, one of the primary sources of TV artwork in your Plex library will be making a configuration change that will prevent any new TV shows added to libraries on older Plex Media Servers from getting artwork. Starting January 31st, Plex Media Server version 1.18.2 or higher will be required to continue fetching TV show posters and episode thumbnails from TheTVDB. If you’re currently running an older server version, make sure you grab and install the latest release to keep thing…

Edit:
… should be one part of the problem