No, but it isn't unusual for stuff to get a bit oily down there. Clean it out with contact cleaner or naptha-based brake cleaner and see if it comes back.
F125s are really genuine only tbh. There are chinese copies of one of the two versions (I don't recall which) but I doubt they are worth the effort of swapping them. However, I have found that 99% of F125 problems can be solved by dismantling the switch, cleaning it thoroughly, reapplying a tiny bit of contact grease and reassembling it. My own on the grey S8 has been going for 5 years since it's rebuild.
If you do replace it, don't bin the old one - send it my way
