Hi, on the planet Vulcan, the biters are trying to find a way to the pollution caused by the player, but they can't because there are too many impassable rocks on the map, which causes a noticeable UPS drop.
Therefore, it does not make sense to place enemies on such planets. There is a high-quality mod for the volcanic planet Moshine, whose terrain is open and suitable for enemies, so it would be better to add the ability to place them there.

Its optional... why have you added the mod afterall ?

To diversify enemies. I understand that this is optional. If you install a lot of mods for enemies, they will all be mainly on Nauvis, which is not very interesting, so I placed those that were possible on other planets and found that Vulcanus, like any other planet with impassable rocks, is not suitable for this.
People may start playing with explosive biters on the Vulcanus without knowing about it and then encounter a noticeable UPS drop even on good computers, and to fix this, they will have to remove the enemies with a console command, which will also remove the destroyer worms, which may spoil the game a little, and if they had known about this in advance, they would not have placed these enemies on the Vulcanus. I simply suggested another planet that is more suitable for this.

I mean.. there is a mod option on Explosive Biters, where they will spawn... nauvis only, nauvis+vulcanus, vulcanus only.. but once spawned, changing option here will do nothing