GoMap!! let me break a multipolygon but not fix it

[dieterdreist]

There is a multipolygon pedestrian area attached to a highway centre way. I tried to detach it but it was opened on “disconnect”:

trying to disconnect the other node which remained on the road I get an error:

[dieterdreist]

managed to get further, but I don’t manage to remove elements from the relation

[dieterdreist]