Put the summary of the bug you're having here

I brought a zombie Pigmen in the sun,
I thought it would die and I would get gold

*What actually happened- the fire animation was showing that it was burning but, It did not die

Steps to Reproduce:
1. Go into the nether reactor and don't kill the zombie Pigmen
2. Lure them into a hole deep enough so it won't escape
3. Go to sleep then when you wake up, go to the hole where you trappers the zombie Pigmen you should see it burning because it is in sunlight,
4. You will notice it will burn until night and still not die