The bug
When the wither shoots blue witherskulls it does not align its heads. (It shoots blue witherskulls when there is no enemy nearby and enough space around)
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Can confirm in 20w48a.
Can confirm in 20w51a.
Can confirm in 21w03a.
the wither just shoots everywhere even through the back of its head!
Can confirm in 21w05a.

Can confirm in 1.17.1.
Confirmed, though its been like this since the Wither was introduced.