The mobs will spawn but are invisible to players but mobs that add-ons add that are like villagers can be seen or rather sensed by mobs such as zombies so I know they are able to be spawned but cannot be seen by players. One add-on I'm using is called guard villagers add-on that adds villagers that can attack hostile mobs such as zombies and skeletons and I also know that experimental gameplay is turned on so that can't be the problem.
The mobs will spawn but are invisible to players but mobs that add-ons add that are like villagers can be seen or rather sensed by mobs such as zombies so I know they are able to be spawned but cannot be seen by players. One add-on I'm using is called guard villagers add-on that adds villagers that can attack hostile mobs such as zombies and skeletons and I also know that experimental gameplay is turned on so that can't be the problem.