Hello,
I have the exact same crash
Attempting to create a breadcrumb action for a scene handle which already has one (sceneID:<app id-default>). Are you trying to active an app that's already active?
The app supports iOS 11.4+, I don't use the UISceneSession Lifecycle for that reason.
It crash when I open the app from TestFlight (I did not tested this for AppStore yet)
Thanks