Apart from the boundary relation, I don’t see major issues here.
https://www.openstreetmap.org/way/991425177
(But boundaries are preferably not snapped to roads, at the very least they can be snapped to buildings.)

Other possible "overlaps" are with items like those:
https://www.openstreetmap.org/way/1284891362
But this one has layer=1, so it is normal here to be drawn above other objects.