Updated sysdiagnose has been uploaded to feedback report https://feedbackassistant.apple.com/feedback/16933592

Tested on iOS 18.5, Beta 1 (22EF5042g), same issue is still present. getFileProviderServicesForItem fails when called from the consuming app with: Error Domain=NSCocoaErrorDomain Code=513 "The file couldn’t be saved because you don’t have permission." The supportedServiceSources method in the service hosted by the provider app is never invoked when this occurs.