The bug

If a melee piglin attacks a player, they'll hold their arms up like a zombie in Bedrock while in the Java Edition, they use a animation similar to the player's.

Piglin attacking in the Bedrock Edition
video-1588758533.mp4

Attacking animation in Java Edition
Minecraft 20w18a - Singleplayer 2020-05-06 18-47-19_Trim.mp4