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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