Steps to Reproduce:
Step 1: Summon a piglin brute.
Step 2: Hurt it until it have low health.
Step 3: Summon a charged creeper, then use flint and steel on it near the piglin brute.
Observed Results:
Nothing drops.
Expected Results:
Piglin head will drop.
Piglin brutes aren't the same as piglins. In other words, piiglins and piglin brutes are different entities, hence why piglin brutes don't drop piglin heads upon death from a charged creeper explosion.