Using Debugger never loads the app in iOS Simulator — 0.61.1

The issue

As a developer, I expect that using the debugger will still render my app.

With a brand new RN project in 0.61.1, when I trigger the debugger in the iOS simulator the app remains in the "loading" state.

I made zero modifications to the initial RN template. I only hit ⌘-D to open the context menu and selected "Debug" (see video).

This was working as expected with 0.61.0 in a project I made two days ago.

react-native 0.61.1
react-native-cli 2.0.1

"Debug" will load the app in the simulator.