If I can remember correctly every single sfs piece I have had I have gotten a tear in it somehow.
That said, it has
NEVER been an issue for me. If the hole is smaller than this
, I never even bothered to mess with it. I would just be careful with a brush or comb and that was that.
If the hole gets bigger than a pencil eraser I would grab the invisible thread and perform emergency surgery. Takes about 15 minutes and the problem is taken care of.