Is your feature request related to a problem?

While it's possible to add logic for Endermen to spawn in other mods' biomes, the blocks they can spawn on appear to be hardcoded. Because of this, adding biomes from other mods to the biome spawning tags only works if said biomes contain blocks which the Endermen can stand on. For mods like BetterEnd, which uses its own blocks for the surface of most biomes, this severely limits where Endermen can spawn.

Solution(s)

The blocks which Endermen can spawn on are defined by one or multiple block tags, similar to several vanilla mobs.

Describe alternatives you've considered

Specific support for BetterEnd moss blocks is an alternative, but much less flexible.

Mod Version

1.0.4

Mod Loader Version

47.3.0

Mod Loader

Forge

Additional context

Also checked to make sure this wasn't present in versions for 1.21.