That happen to me because I had a fatalError somewhere in my view.
rgkobashi
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This is so annoying, it interrupts my whole test flow.
I have disable the option AutoFill Passwords on Settings -> Passwords and accounts, it seem that it worked, at least on the simulator.
This is because Xcode 12 expects to use imports with <> instead of "" on umbrella headers. Thus this is a cocoapods issue, you can find more info here - https://github.com/CocoaPods/CocoaPods/issues/9902.
The fix I used was using the latest version of cocoapods which has this fix, as for now 1.10.0.rc.1.