In Xcode 11 beta 4, the app compiles and copies, but then it tells Build stopped ... no issues. The app does not start then.
What reasons may cause this behaviour?

I can reproduce this by hitting Command-Period in the middle of a build.

In other words, I'm suggesting that "stopped" here doesn't mean "came to a stop", but rather "was stopped" - i.e., "you stopped me." That's the only thing I can think of - you're interrupting the build somehow.
I also see duplicate answers suggesting that a pod script can cause this:
Cocoapods pod install as a target dependency
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