Ah - got it: In the past there have been 3 nodes: The saddle 10221246496 (20m besides the road), a pass 10598911072 20m away from that saddle (in the road) and an other pass ~200m away in the road (I did not see it).
I unified the two nodes which were close together. So, as far as I understand, I should move the modified node to the old position of 10221246496 (and remove node from road) and remove the mountain_pass tag, because real pass is ~200m north, right?
I would appreciate if you could confirm (I want to avoid further chaos :-) ).