Hi, there is a problem with the validity of the multipolygon
https://tools.geofabrik.de/osmi/?view=areas&lon=145.46365&lat=-37.88371&zoom=12
https://wiki.openstreetmap.org/wiki/Relation:multipolygon
inner rings can't touch and inner rings cannot share an outer boundary ring.
..hint: don't use any multipolygon here. Use a bunch of simply polygons instead.