Switching generator results in "Parsing of CMake project failed: Connection to CMake server lost."

1. Open a CMake project that is not actually built yet
2. Switch the generator in the kit
3. Parsing fails with "Parsing of CMake project failed: Connection to CMake server lost."
4. Restart Qt Creator and open the project again
5. Parsing succeeds now with the new generator.

Expected: Restarting Qt Creator should not be necessary.