I was making a zombie riding a spider and when i gave the spider invisibility in the riding command, i started to notice that i could see through its model, not necessarily like the abdomen part isn't there or anything, but like cut off the top layer and the back and side layers, i could see the spider like that. This also happens with the zombie. I've seen this bug reoccurring in many other ways but this one is by far the weirdest considering it didnt happen until io gave the spider invis.