In Schleswig-Holstein on L28 it looks like the west shape point between L190 and L29 could be moved to the visible point for what appears to be either K69 or K64. OSM calls it K64, but the reflectors show K69 labels on the posts near the L28 intersection while having K64 labels on the posts near L190. Maybe the designation changes somewhere in the middle or there was a renumbering and some posts still have the old number?