While mining I found a dungeon that generated as normal, with two chests and the correct size. However, the monster spawner in the middle of the room has no spinning mob in the middle of it and it does not spawn anything. My mode is Normal, and there were mobs around the dungeon. Even with hitbox viewing mode, I can't see any entity in the middle of the spawner.
Please provide the seed of the world and the coordinates of that spawner.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) to this ticket.