Enderman visual glitch in plastic te

I was playing in the plastic texture pack and encountered an Enderman. No big deal, i will look at him and smack him around a bit with a sword. Keep in mind this is night time.

I look at him and my first thought is they made these guys look Rabid and foam at the mouth. Then he spun in circles and i realized that the transparent part of his angry face is white and made him look Rabid.

There is a glitch with endermen in the texture pack. The glitch is visual and hilarious but still not supposed to be happening

Wanna see this happening. I thought on my feet and grabbed a recording
https://youtu.be/9F_d5Az6lwg