How do I remove the zombie spawn limit? I want to have 100 zombies spawned at the same time.

So far, I've been able to increase the limit from 24 to 64, but it seems something else is limiting the number of ai I can after that.

Here is what I've done.

First, I set:

level.zombie_ai_limit = 100

After this, the limit is changed to 31. (Still limited by level.zombei_actor_limit = 31)

level.zombie_actor_limit = 100

After this, the limit is 64.

I can't find any variable to increase the 64 limit. Can someone help here?