I don't seem to be able to see what causes this, though maybe it's cos when you do

@Override
public List<Biome.SpawnEntry> getMonsterSpawns()
{
    if (CarpetSettings.huskSpawningInTemples)
    {
        return MONSTER_SPAWNS;
    }
    return Collections.emptyList();
}

It adds the Monster spawns to the regular spawns you would find in a desert temple

??
is that 20w21a with old (pre 2021) structures in it? Then its a vanillla bug.

yeah, I'm also getting endermen spawning in my shulker farm where they didn't previously. I assume that's a vanilla issue since nothing related to spawning changed in carpet

@gnembon no, I was in 20b

might have been related to the ongoing structure changes. I changed the mixins completely in 21a. Please confirm its working / broken on 21a. What's version that enderman spawn in your bits @rintaun ?

@gnembon my issue is in 21a

I had 1-high platforms of soul sand; endermen never spawned on the top platform. in 21a, endermen spawn on the top platform so I added the slabs seen in the screenshot

ah, yeah my issue is definitely caused by https://bugs.mojang.com/browse/MC-184740 fwiw. probably not the same as what this one is describing

yes, they forgot to rename structures appropriately in 21a, and old structures are not recognized.