Panels 3 One-Time Purchase is gone

I recently bought the Panels 3 One-Time Purchase. Then I started to encounter some problems with the iCloud integration (see other thread) and so I went and followed the recommendation and installed Testflight to test the Beta. in the Beta I again „purchased“ the Panels 3 One-Time purchase to test the iCloud integration further. After I found kind of a workaround yesterday, I stopped the testing of Panels in Testflight and wanted to use the regular app again. But there my One-Time purchase was now not active anymore. So I tried „Restore purchases“ but that didn‘t work. How can I solve this?

It seems the app is still the beta version. I had to delete the app completely and reinstall it from the Appstore to get it to work again. Problem solved.