Zombie Pigman and Wither Skeletons lose their helmets on daylight

I'ts all said in the title.I had to make plates 250 blocks in the sky for them not to lose their helmets but then normal mobs didn't burn. That is a big problem not just for me but for other mapmakers too. I know it is hard to fix becose of the Undead/non-Undead but please fix it.
It will also fix Zombie Pigman, Wither Skeletons and Husks not to burn at day in the OverWorld