Piglins, Brutes and Hoglins that spawn during world generation in Bastions somehow differ from those spawned naturally, when changing their behaviors using Behavior Packs only ones that spawn naturally(or using Spawn Eggs) will be affected by the changes made...

I made a Behavior Pack to show that, in this one those 3 Mobs are supposed to only have 1 HP but for some reason the same won't happen for those that during World Generation are spawned in Bastions! I tested that with Vindicators in Mansions too, but apparently that's only a problem with those 3 Mobs!