Hello Me and my Friend are playing on FTB Evolution 1.21.1 with the version of the mod (In description), and we can't get mobs to spawn in either dimensions.
Is there some problem with the dimension or are they forbidden spawn locations?
We spent an Hour trying to figure it out but i lost patience, so I am here to ask.

Those dimensions likely use biomes with empty spawn tables, which is what the dirt uses to know what monsters to spawn.
Do monsters normally spawn there? like naturally at night?

so thats probably the issue, can you find out what biome it is in the two dimensions? i can tag them so the dirt ignores their table and uses plains instead.

also what the dimension mod is.

Will send in about 20 min. after i get a leg pain under control. :)

No :(
Only day as well...

jamd-neo-21.1.1+mc1.21.1 - Just a Mining Dimension (Mod Name) - Biome: Mining
javd-neo-9.0.0+mc1.21.1 - Just a Void Dimension (Mod Name) - Biome: The Void
Both are on NeoForge

got it, ill have them tagged in the next update.

Thank you for the help.
I will be closing the issue.