When I start a command block summoning zombies on a continuous loop in spectator made them brieflyappear and the disappear.
What I expected to happen was...:
The Command block would comtinue spawning mobs when I changed gamemode
What actually happened was...:
The Zombies briefly appeared and the disappeared. Nearby Villagers continued Without getting hurt. When I change back to survival they started spawning again.
Steps to Reproduce:
1. Open a super flat world.
2. Find a village
3. Just outside it put a command block with the command:
/summon Zombie
4.Attach it to a loop
5. They start coming but then change gamemode:
/gamemode 3
6.They stop spawning
7.Change gamemode back
8. They start spawning again.
This issue has been reported already. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.