Custom Mobs not Spawning in Custom Dimension

Issue description

I was making a weird mod for my friends, but almost all of the custom mobs will not spawn in the custom dimension. I don't know why because the dimension has overworld behaviour, and the mobs that don't spawn are set as Creature. I'm not sure if i'm doing something wrong, or this is a bug, thanks!

Issue comments

I want to contribute to your issue fixed link.

The issue is not only on custom grass blocks. My dimension has regular minecraft grass que no mobs spawn at all even if I set the block type to grass.

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