Weird behavior on iTunes Connect internal testing

I am trying to deploy my app to App Store, stuck at Internal Testing. When I start the app, it shows the splash screen, then immediately goes back to iOS home screen without showing anything else, as if it crashed. It does not crash though, and I can see it (now past the splash screen) when I double-tap the Home button. An attempt to bring it to front brings me to the home screen again. I think it’s just an old snapshot, because it does not display any new data, not even when I kill and restart the app.

I can’t duplicate any of that while running directly connected to Xcode.

No crash reports.

What can I do? Can I reach the phone’s console?

Edit: deleted and reinstalled the Private Beta app. Now it only shows the splash screen, even on double-tap.