Possible Fixes

Yes

Modpack Version

0.60

What happened?

Started server and shortly after loading the world it hangs with various backtraces and doesn't fully start up.

I tried this with my original world and with a freshly generated world. Linked in the gist is the run from a freshly generated world.

Latest.Log

https://gist.github.com/natebc/9294f418e7a583e5d53561f8f779b611#file-latest-log-L3536

Debug.Log

https://gist.github.com/natebc/f7d079da820a01d8e885613f3e72dd51

Logs doesn't indicate anything about the server hanging. The recipe and minecolonies spam is normal. If anything i'd think this server was joinable (the server list in game doesn't properly ping the server because of another bug)
What is your server watchdog timeout set to? If it is hanging letting the watchdog crash the server will usually reveal what it is hanging on

Turns out the world loads just fine, it's just that the errors and backtraces happen right at the end of the dedicated server coming online so it seemed to have failed.

/close