I confirmed that [MXMetricManager addSubscriber] is called twice - it's invoked from another internal swift framework. Should there be only one subscriber? We had to remove a subscriber and release a version to stop the influx of crashes. I submitted a bug using Feedback Assistant: https://feedbackassistant.apple.com/feedback/11525011 I see that it says "Potential fix identified - For a future OS update"

Seeing this here as we're getting alerted due to a spike in crashes due to this issue since the public release of iOS 16. Full crash report attached. metrickit.crash

It looks like the medium widget always appears in the result list of [WidgetInfo] when WidgetCenter.getCurrentConfigurations() is called, even when the widget has not been added to the homescreen.

You can also attach to the process (Debug -> Attach to Process) and choose the widget extension process after running the app.