When I select a saved filter with excluded namespaces in RecentChanges, those namespaces are not excluded: "Exclude selected" in the "Namespaces" menu is not marked, even though it was marked when the filter was saved.
This has the effect that all other namespaces instead are excluded. This occurs in my English, Swedish and Test2 Wikipedia accounts, so appears to be global.
This does not occur in my Swedish Wikipedia account when the RecentChanges page is initially loaded with my default filter which was saved some time ago and has excluded namespaces, but it does occur in my English account when the page is initially loaded with a default filter that was saved after I first noticed this error. Changing the English default filter to a filter that was saved some time ago does not make the namespace exclusion work on initial page load.