I can’t speak for the use case with a NFS mount. I am experiencing a similar issue on a local mounted volume for my media data. So, as you mentioned, it probably doesn’t have any impact.
If you want to check the directory structure inside your running container, you can open a shell prompt : docker exec -it plex bash.
All internal data of a running container is stored on the host.
I noticed these posts [1] & [2], from all the way back in 2017, which match my issue. It looks like it might have started earlier than I thought.
