when you use a mace smash attack on an ender dragon, even in locations where the dragon itself doesn't apply knockback, you still get knocked back, likely by your own mace.
Steps to reproduce:
go to the end and destroy the end crystals to make the dragon perch
go at the tail ender dragon, since the dragon does not knock entities behind it
use the mace smash attack on the dragons tail (with the help of a wind charge)
Observed result:
You get knocked away from the dragon.
Expected result:
You fall down back at the dragon's back.
Note: by trying the same exact steps, but with any other item, you will normally fall down as expected. only happens when using the mace.
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Relates to MC-196953

Can confirm for 1.21.3
Can confirm. Also affects 1.21.3