Cannot run unit tests in QtCreator

How to reproduce the problem:

• Start QtCreator 4.15.2.
• "File | New File or Project | Other Project | Auto Test Project". The project is attached.
  • Test framework: Qt Test
  • Test case name: First
  • Build system: CMake
  • Kit: Qt 6.2.0 for macOS
• "Build | Build Project 'First'". Build works fine.
• "Build | Run". Running the project prints the test output in the "Application Output" pane.
• Problem: Switch to "Test Results" pane. All the buttons to run tests are disabled. The same is true for the run-test actions in the menu "Tools | Tests". "Tool | Tests | Rescan" shows a full green progress bar, but nothing changes.