According to minecraft :Piglins arms are now behaving more like the players arms, and less like the zombies arms MCPE-74089(1.16.20.50)
This means that zombified mobs like zombie and zombified piglins should have this arms :
https://1drv.ms/v/s!Av8v0VZb-r4rgXm-wMwx9SXH6brr?e=xH0gY3
In the video there's a piglin (1.16 ) who has the zombie arms is actually a bug he shouldn’t have this zombies should
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