Hi,

if you add tags on the outer way of a multipolygon, the multipolygon doesn't work because the inner area is hidden by the outer way, see https://wiki.openstreetmap.org/wiki/RU:%D0%9E%D1%82%D0%BD%D0%BE%D1%88%D0%B5%D0%BD%D0%B8%D1%8F:%D0%BC%D1%83%D0%BB%D1%8C%D1%82%D0%B8%D0%BF%D0%BE%D0%BB%D0%B8%D0%B3%D0%BE%D0%BD

I fixed it.

Best regards