In both my regular world and my Single biome Primordial Cave world, There are an Unholy amount of Cave Centipedes and Murmurs inside it, Causing immense lag. (I am playing with the Alex Mobs mod too if it wasn't obvious)

Could you please fix it?

caused by another mod (Alexs Caves Tweaks) because of biome tags I intentionally did not add to my mod. take it up with those devs.

Oh, Thanks

@CluckCluckDonalsthe5th follow my suggestion here TelepathicGrunt/TACT#3 (comment)

@AlexModGuy The issue is not tact. The issue is Alex’s Mobs is not setup properly to spawn those cave mobs at a proper rate in monster-less biomes. You will get this issue for any cave tagged biome from any mod that has no monsters. Heck may even impact non-cave biomes too that dont have monsters if you're adding monsters to them. Which causes the centipedes and murmurs to be the only monsters and spawns out of control since you don't use the spawn cost system and instead, the normal spawn system.

Alex's Mobs needs to add consideration for that fact that there can be biomes with no monsters in them like vanilla Mushroom Biomes. Can add a check to see if biome has any vanilla monsters in them and if not, do not add your own monster mob to it. Dynamic and works to solve the issue cleanly universally for any modded biome.

It's on the mob mods to make sure they do proper checks and spawn their mobs correctly. Not the biome mod's role. Biome mod just adds biomes that should be tagged properly. Everyone else has to handle that properly. I wouldn't blame a mod adding a monster-less forest biome and tagged it as is_forest but another mod adds monsters that spawns and takes over the forest biome at an out of control rate at night. The mob mod should've checked first to verify if monsters should be spawning in the forest first before adding to it.

I'll pitch to Neoforge and Fabric to add a c:no_monster_spawns or similar named tag in 1.21 Minecraft to make it easier for mob mods to exclude monster-less biomes and make it more obvious that such biomes exists like mushroom biomes and deep dark.

Also, Deep Dark is tagged as is_cave so your murmurs and and cave centipedes would've spawned like mad in there except you manually excluded Deep Dark from your cave tag check in Alex's Mobs. So not sure why the fact that the existence of other modded biomes without monsters makes it the fault of TACT when this issue is going to happen with other people's biomes too when they copy what vanilla does for monsterless biomes...