Left 4 Dead 2 Infected Texture Bugs

I know that the models from both L4D and L4D2 are extremely bugged, but I can’t find anything on the internet about this:

All of the new L4D2 common infected (but not those featured in L4D) have this weird texture bug. Does anyone here know why and/or how to fix it?

Does no one know, or am I just being an idiot and missing some obvious fix?

my info may be outdated, but i believe they dont work since l4d 1 and 2 use a differnt engine version, which gmod has a hard time with. this may (or may not) still be the case

I’ve heard that too, but the special infected don’t have this bug, and all the L4D1 models are normal as well.