What I expected to happen was backup zombies wouldn't spawn when domobspawning is false as they are a naturally spawn
What actually happened was i did /gamerule domobspawning false and it still spawn backup zombies when we kill the zombies that we spawning
1.Make it so when /gamerule domobspawning false all naturally spawns will not happen including backup zombies
Duplicate of MC-14722
Still unresolved, but please use search.