This happens with all the entities.
Linked issues
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Comments 2
Duplicate of MC-140857
MC-154089
The arrows of the pillager and skeleton bounce sometimes
Resolved
Duplicate
0
This is WAI, and caused by hit delay. To cite the minecraft wiki:
Immediately after hitting the target, there is a 0.5 second cooldown period during which the target will be immune to further damage. Arrows hitting the mob in this state will lose all speed and drop to the ground.