Test Flight Distribution breaks App on iOS 12.5 devices

We encounter a weired behaviour after distributing our app to Test Flight. When building locally, everything is fine on our 12.5 test devices. After launching the app via Test Flight the app goes into the app switcher screen and is stuck there showing the miniature splash screen.

Anyone encountered a similar issue? The app was build with Cordova.

Thanks!

Test Flight Distribution breaks App on iOS 12.5 devices
 
 
Q