Searched and this was the only thread I found on this subject.
Has there been discussion about which mod is causing this? Because none of the dungeons I have built for my players on the server are working anymore, and I do not want to just turn on all monsters at night, as its more a building server with the few areas I have designated as hunting grounds.
If someone knows, or could at least point me in the right direction to start my search it would be wonderful.
edit: I have tested setting up a vanilla server, and it still works properly with difficulty=2 spawn-monsters=false
edit2: With the way things are currently, you cannot spawn mobs with eggs by placing them or with dispensers unless spawn-monsters=true, which is different from vanilla.