text: So, you are saying that the River Thames multipolygon (www.openstreetmap.org/relation/28934) is still broken? I have looked at it in JOSM and run validation on it. It reports some warnings (on the island inners) but there are no errors reported on the outers and they constitute an unbroken set, albeit they are not ordered correctly. I’m not an expert in multipolygons but having an unordered set of outers doesn’t appear to me to be a problem that should affect the rendering. So, if there is still a problem with rendering then I think that we are going to have to wait for a multipolygon expert to come along and resolve it.