This issue is resolved. If you're seeing segment efforts listed multiple times on your activities, please try refreshing your activity achievements.
This issue has been resolved in the most recent version of the Strava app. Update to version 150.0.1 or higher from the App Store and you should no longer experience crashes.
You can now hide and unhide running segments without having to star the segment. For more information please see: https://support.strava.com/hc/en-us/articles/216918177