Install 5.13.0 RC iOS binaries, launch Creator.
Open any of the examples and build. Build output says 'xcode build fails'.
When launching the .xcodeproject file (created by Creator) in xcode and build, there is errors about singing:
Simulator build works and deploys correctly.
Does not reproduce on released QtCreator 4.9.1, fails with QtC 4.10.0 beta1.