How to trigger:
Create a new world. Use Creative Mode and Super-flat (recommended). [Also, it is highly recommended that you disable the gamerule “MobSpawning“ to avoid other natural mobs attracting Wither’s hostility! By doing so, the Wither won’t go away; it will just stay stationary!]
Summon a Wither [Use the command “/summon wither“]
Wait for its first explosion (when it is fully ready)
Go away for a distance, until the Wither disappears in your vision (when the Bossbar of Wither disappears )
Go back to the Wither’s initial position
Now you can see the funny scene! The Wither repeats its spinning animation for a few seconds! It seems funny!
We're tracking this issue at MCPE-187724, so I will resolve and link this report as a duplicate.
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