I have analyzed one of the dumps and it looks similar to one that is fixed in latest Plex Pass beta
(Hubs) Fix potential serialization issue of CW hubs (#13237)
Would need matching server logs to confirm if same issue
So either wait for the beta to become public release and try it or get me matching server logs and dumps (new zip of the $TMPDIR directory with the server logs zip after next crash) and I can then confirm it is this issues - fixed in 1.25.3 or a new issue