Plague rats still spawn.
Quagmire has an issue with that, they also don't despawn, nor do sludge lords.
So Sluge Lords should probably be treated like either Rarespawns or the mini-bosses they are and not be spawned. They soak up all the mob spawn limit after a certain point.
I bandaided it by butcher bombing the quag in an 80 block radius
Plague rats still spawn. Quagmire has an issue with that, they also don't despawn, nor do sludge lords. So Sluge Lords should probably be treated like either Rarespawns or the mini-bosses they are and not be spawned. They soak up all the mob spawn limit after a certain point. I bandaided it by butcher bombing the quag in an 80 block radius