Affects Version/s: 220.127.116.11 Beta, 18.104.22.168 Beta, 1.12.0, 1.14.30 Hotfix, 1.14.60 Hotfix
Fix Version/s: None
Some mobs spawned on top of buttons (spawned from a spawn egg) will not move. Mobs that are chasing players or villagers will always jump around buttons similar to fire however they can randomly successfully pathfind through buttons while jumping.
1. Spawn mob on top of button (make it 3x3 and crouch to spawn mob)
2. Mobs don't pathfind or move
1. Spawn hostile mob one block away from button
2. Go to survival
3. The mob chases you but jumps around the button and rarely stop