Server stuck loading with Flans Mod 1.12.2

Hey! I have a server i try to run with sponge. In the server modpack, we have flans mod which i have found to cause a problem when starting the server. It stops after loading all the worlds, at loaded advancement trees.
Here is a screenshot: Screenshot_2

Debug.log
https://pastebin.com/embed_js/0AhDAnPU

That is not a complete log, so most of the important information is absent. It’s not much use.

Have you tried using the Sponge Bootstrap to launch the server?

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