Custom Entity Spawn.

So i'm making a mod and have a custom biome set in a custom dimension. I also have a custom entity with spawning type set to ambient and biome restriction set to that specific biome, but for some reason the entity just straight up refuses to spawn, even when i tinkered with all the spawning settings.

I went back to my older mod  where i had the same exact setup and i clearly remember that back then the ambient entity used to spawn normally, but now it's the same as the new mod. It just refuses to spawn.
Idk if i'm doing something wrong or if this is a mcreator bug.

I'm using mcreator 2025.1 and neoforge-1.21.4