Ive been having a problem of zombies going invisible (trust me).

So far this has only happened 3 times in just one world, and it hasn't happened to other mobs, just zombies.

When the zombie is invisible it can still attack me but i'm not able to attack it, so whenever it hits me I have no choice but to run.

I know its only zombies because whenever it happens I only hear zombie noises.

Also this doesn't happen to all zombies, it only happens rarely.

This could not have been an online prank because i don't even have Xbox live, I don't see potion swirls it's just... nothing.

sorry i cant attach a picture. even if i did it would be a picture of nothing