Happens after starting the server up every time. First autosave "saving all galaxy data" or whatever it says in the console, and it just hangs there. Server doesn't kick players out or anything, you can still move around and shoot and go into build mode, but no interaction actually occurs. No damage to ships/asteroids from weapons or mining, no block placement or deletion in build mode.
Server logs from most recent session. Sorry for Drive link but they're too big for pastebin because I had verbose logging enabled.
https://drive.google.com/drive/folders/1iqDAdp_1A5sHpUkhf0pgLrsQow2xENMT?usp=sharing