A breakpoint placed at the cascading worldgen line points me to this line.

https://github.com/Vazkii/Quark/blob/27ea8d931fdbf19a8fcc3dc6fbbaea37ce43e4f0/src/main/java/vazkii/quark/world/feature/VariedDungeons.java#L115

As I don't know how to fix cascading worldgen, assigning this to Vazkii.

Still an issue