I’m trying to do a union here:

[out:json]; area["ISO3166-1"="SE"][admin_level=2]; ( nwr["tourism"="wilderness_hut"]["access"!="private"](area); nwr["amenity"="shelter"]["shelter_type"!="public_transport"](area); ); out center;

It does not work (I only get ~200 huts and no shelters) :(