Hi rkdclgh,
this changeset has created several errors regarding self intersecting ways:

https://tools.geofabrik.de/osmi/?view=geometry&lon=126.55335&lat=35.04408&zoom=12&baselayer=Geofabrik%20Standard&overlays=self_intersection_ways%2Cself_intersection_points%2Csingle_node_in_way%2Cduplicate_node_in_way

Obviously a boundary line with attached water areas has been displaced.

Can you please fix this?
Kind regards
Guido