I have been stuck on this for about a week now. I thought this was an issue with my MacOS version and/or Xcode version, however it is actually an issue with the simulator version. With that in mind, I was able to download iOS 13.0 simulators and deploy the Juice app there as a workaround.

Bumping this. I'm having the same issue with the latest Juice example app and "Sign in with Apple"