After updating to watchOS 11.1, updates using WidgetCenter.shared.reloadAllTimelines() in WKRefreshBackgroundTask stopped working. When the background task is triggered, it gets data from the phone and updates the WidgetKit complications. But now the refresh call WidgetCenter.shared.reloadAllTimelines() does not update the complications.
Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. I'd greatly appreciate it if you could open a bug report, include sysdiagnose and sample project, and post the FB number here once you do. Bug Reporting: How and Why? has tips on creating your bug report.