Bats keep spawning everywhere in my custom dimension

Hi.

I've recently made a mod about the backrooms, and it seems to be going all good and well until i realized that bats where spawning in the custom dimension.

While I was in game, I tried to just execute a command that would instantly kill all bats, but everytime more would just spawn. It would spawn so much to the point that when I did execute the command to kill all of them, it said that 1503 enteties were killed.

Does anybody have a solution to prevent bats from spawning or at least reduce the amount they spawn? If you do, please reply.