Dumping all mob spawn data, there are a lot of disabled ancientbeasts mob spawns showing up with weight: 0. Might be better to not register those spawns at all.

Weird I never registered any mob with no spawn weight. In the default settings not even a single mob have weight:0. How did that happen?

@Un-Original1 Apologies for the misunderstanding, I was referring to what happens when a mob is configured with a spawn chance=0. Either way this is not a big issue.

Ah, ok. I've been hearing of problems with mob spawning since a few days ago, so I thought this was an instance of those issues.