Zombies do not display fire

When a Zombie is lit on fire, it should normally show the fire. But, Zombies do not display the fire. However, the Zombie does still take damage. This includes all types of Zombies(not including Pigmen, they don't burn), and a few other mobs, to name one, Pandas.

 

I have provided a video of a Zombie not catching fire in the sunlight.