I was viewing my Local Legends and clicked on the three-dots in hopes of editing something, and it offered “Leave Local Legends” which sounds like a common situation in a browser when one wishes to depart from some display. It appeared that I needed to do that in order to proceed to editing so I chose that.
Then, it notified me that it deleted all my Local Legends records and I could rejoin Local Legends and start over.
I hope this can be reversed but I cannot find any way to contact Strava for support about this, and if it cannot be fixed I will not renew my subscription and will have to devote time every day to discussing this topic all over the Internet.