I don't see how the southern part is also a multipolygon, it is just a way defined as outer: https://www.openstreetmap.org/way/388756073
The southern part really is part of this one forest called Hallerbos (relation 8690) which is split in two by the E19. I would think only the relation would need a name, not the building blocks. Also, in this case, I think it would actually be better to have two multipolygons: * one with the outer lines for both building blocks, which only has the name information and the fact that this is a nature area. For most nature areas, that would just be a way, the "outer" way of the nature area. * one without the name, just for the landuse. The "inner" parts are not forest, but they are very much part of the nature area. For the landuse mapping, there is no need to have the parts on both sides of the E19 as one object. So these could be two multipolygons in this case. I haven't made this change myself, as I remember someone telling me it was just fine like this.
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