The piglins and piglin brutes don't keep their weapon when being converted into zombified piglins.
Step to Reproduce:
1. Spawn a piglin brute/piglin with a crossbow in the overworld.
2. Wait until it converts.
The Piglin Brutes/Piglins don't keep their golden axe/crossbow, instead it gets replaced to golden sword after being zombified, like piglins with golden swords.
The piglin brutes/piglins keep their golden axe/crossbow after being converted into zombified piglin.