The bug

Normally they don't equip armor since they're strong. With a dispenser however, armor can be dispensed on piglin brutes.

How to reproduce

1. Enter the Nether and spawn a piglin brute:

   /summon piglin_brute ~ ~ ~ {NoAI:1b}

2. Place a dispenser facing the piglin brute
3. Insert a piece of armor into the dispenser
4. Power the dispenser
   The piglin brute equips the armor

Expected behavior

The piglin brute would not be able to equip armor.