Steps to reproduce this issue:
Place a fence.
Summon a mob, like a mule.
Tied it to the fence when it’s far from that fence.
Observe its movement.
Expected result:
The mob would wander around.
Actual result:
The mob wouldn’t move.
MCPE-221322
Leashed mobs do not wander when far away
Open
0
Also applies to mobs who have been pulled by the lead when player stops pulling them, self fixes when lead gets slack or breaks.