Ky_AT, you broke Lake Saint Clair with this edit.
You added https://www.openstreetmap.org/way/945926982#map=15/42.57549/-82.61028&layers=ND with an inner role to the Lake Saint Clair Relation.  It shares nodes with one of the outer ways. JOSM error is "Multipolygon outer way shares segment with other ring".