Hi,
I think you have tried to make a hole in a tree area. What you have made is a 'self crossing way, or a 'dplicate segment'. See https://tools.geofabrik.de/osmi/?view=areas&lon=148.05925&lat=-42.14655&zoom=17&baselayer=Geofabrik%20Standard&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

To fix it - make a new way for the hole. Enter the new way into the relation with the role 'inner'. See https://wiki.openstreetmap.org/wiki/Relation:multipolygon#Multipolygon_created_by_only_one_polygon