To reproduce, shoot an enderman and two zombies (in that specific order) with a single arrow, shot by a crossbow with piercing I. The arrow will not pierce through the first zombie or damage the second one because the enderman was already "pierced" by the arrow.
MC-145557
When a piercing arrow "hits" an enderman, the arrow loses a level of piercing
Open
9
(Unassigned)
Confirmed
Entities, Mob behaviour
crossbow, enderman, piercing, shoot, teleport
Minecraft 19w09a, Minecraft 19w11a, Minecraft 19w12b, Minecraft 19w14b, Minecraft 1.14 Pre-Release 5, ..., 1.20.4, 1.21, 1.21.3, 1.21.4, 1.21.5
Retrieved
Can confirm in 20w51a.