Despite refreshing metadata, posters keep disappearing from my libraries

Server Version#: 1.40.4.8679
Player Version#: Plex web 4.136.0
Plex Media Server Logs_2024-08-13_22-48-18.zip (2.7 MB)

I am having trouble with my plex media thumbnails/posters. When I load plex on my browser, I see only black squares for all videos and tv shows except those I’ve recently added. If I refresh metadata, the posters reappear, but if I restart the docker container then they go missing again. When I view the network tab, I see 404 errors for a URL with /transcode:

This isn’t the first time this has happened. It briefly went away when I tried Manage Library > Refresh all Metadata, but the problem has come back.

My config in docker:

Each of those folders is set to read/write for all users:

Restarting the docker container doesn’t resolve the issue. The rest of the metadata appears intact. There are no error messages in the docker logs. How can I diagnose this? Is it a bad folder reference? Where are the posters stored?

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