So I am at 2% evolution and gone maybe 10 screens to the west and every single biter nest has multiple 35k behemoth worms that regenerate HP so quickly that a flamethrower tank cannot even damage them. Is this intended or some kind of error? Every single other biter near them dies instantly to a single T1 personal laser defense, or just being run over by the tank.

I certainly feel like there's some kind of issue going on here. To be clear, I have no other mods that modifier biters at all besides Bob's. At the moment my only solution is to just not play with Bob's Enemies active until I have reached pretty late game weapons so I can just nuke them...