Mobs are not spawning with the supposed head armor because a tag mismatch

the tag "mob_head_armor" in:
https://github.com/TerraFirmaCraft/TerraFirmaCraft/blob/0d99731dd1048126ccdd6bb49fb3fccd03a82b4d/src/main/java/net/dries007/tfc/common/TFCTags.java#L199C77-L199C77

is created as "mob_helmet_armor" in:

So the mobs can spawn with vanilla helmets (leather, chainmail, iron, gold and diamond confirmed), that can be dropped.

Also zoombies can transform into drowned and skeletons to strays, and in
/src/main/resources/data/minecraft/loot_tables/entities/
there is no loot table to replace the vanilla loot, so they can drop vanilla copper ingots and tipped arrows. not sure if those should be generated from another place

:) cheers!

No 1.18.x?