Please check https://tools.geofabrik.de/osmi/?view=areas&lon=-116.30614&lat=49.10096&zoom=12&baselayer=Geofabrik%20Standard&opacity=0.95&overlays=duplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways and fix issues before further editing.

Please check the outcome of your edits and fix iit if necessary: https://tools.geofabrik.de/osmi/?view=areas&lon=-74.09536&lat=46.05410&zoom=12&baselayer=Geofabrik%20Standard&opacity=0.95&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

Das geht auf das Konto von ID, das offene ways, getagged als boundary=postal_code zu Polygonen schließt. Siehe https://community.openstreetmap.org/t/ungefragte-autokorrektur-durch-id/132903

There is no need to delete objects tagged as abandoned

Siehe https://tools.geofabrik.de/osmi/?view=areas&lon=12.49961&lat=50.71759&zoom=15&baselayer=Geofabrik%20Standard&opacity=0.95&overlays=ring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways
Grenzrelationen verstümmelte durch Löschung von way/571464759

Please check and fix. JOSM/Validator might be helpful.
https://tools.geofabrik.de/osmi/?view=areas&lon=-74.20714&lat=45.68955&zoom=12&baselayer=Geofabrik%20Standard&opacity=0.95&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

Ist dir bewusst, was Du mit deinen Änderungen bewirkst? Hast Du ein Konzept, wie Du die Informationen, die in den verstümmelten Relationen stecken, wieder herstellt?
https://tools.geofabrik.de/osmi/?view=areas&lon=9.05776&lat=51.27667&zoom=15&baselayer=Geofabrik%20Standard&opacity=0.95&overlays=ring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

Löschung des ways way/279108125 hat die Relation relation/3710974/history kaputt gemacht.