[2023] MOVED: Spawned and captured zombies disappear

I'm afraid to say that what you're attempting to do probably isn't possible. Zombies are designed to unload after awhile of non-interaction so the resources can be put to use elsewhere- And that's not a system that modders have access to. Even if you find a way to make them unlimited, the moment you leave your base to go out looting for the same reason- Zombies in unloaded chunks(aka your base) would be removed to put the resources to use on zombies in newly loaded chunks (aka your destination)

Just.. Overall, afaik the settings required to do what you want aren't open to user customization, and even if they were, in both cases messing with that is highly likely to turn your game from a game into a slideshow.