I have an immediate crash on first launch of the server with the modpack. The error is:
Distant Horizons (distanthorizons) encountered an error during the sided_setup event phase §7java.lang.ExceptionInInitializerError: null ] at net.minecraftforge.fml.ModLoader.waitForTransition(ModLoader.java:246) ~[fmlcore-1.20.1-47.3.39.jar%23252!/:?] {}
The only "different" thing I'm doing is running the server via the well-known itzg/minecraft-server docker container.