previously when merging polygons, all tags from all involved
members were merged into the resulting multipolygon. This includes
existing inner members with different tags or outer members that
are not directly involved in the merge operations.
Example: A forest (landuse=forest) containing some clearings
(landuse=meadow), whose outline is in part a river (waterway=river)
is merged with a new untagged area. The resulting multipolygon
would have falsely been tagged: landuse=forest;meadow + waterway=river