Seems to have broken in revision 101 or 102 (can’t revert that far back to check).
The server fails to start with
Plex Media Server is already running. Will not start...
Running a ps shows that no Plex processes are actually running, so maybe there’s a lockfile left over somewhere. I’ve tried removing the $SNAP_COMMON/tmp directory but I still get the same error.
I’ve tried running with --shell to see that Plex can access everything, which seems it can. I also have the removable-media and raw-usb interfaces connected.