I dont know if this was posted before, and you probably already know about this.

in aikido or sambo the arm can pass through the neck.
i think that its a bug or something..
what can you say about it?

As far as i know it's always been around but it isnt a major bug and probably wont be fixed anytime soon or at all, if they want to fix it they probably would have by now I hope this answers your questions

I noticed that mod in most of the mods I play. It is really disturbing because you can't really tell where which arm is.

The fact is that it doesnt happen too often so it isnt a major concern

it doesnt happen too often if you dont try to decap frecuently.. screw me a lot of times . But i agree t isnt a major concern, just something wich make less real the game.