Thank you for the answer. Yes, some of the tracks are from me and I would be glad to fix this problem myself. However, this crossing is quite far from me (at least when cycling), so I doubt that I can make it to this area in the near future.

This post was intended to motivate OSM mappers who are closed to that crossing or might be eventually in that area to have a closer look and fix the map and possibly the sign. However, it might be a good idea to contact the OSM mappers who have been mapping in this area already. Thanks again.