All kits are shown as a replacement kits. Works OK in QtC5. See screen shorts: one screen shot is for QtC6 and another one is QtC5
Running on: MacOS 11.6 (20G165), MacBook Pro (13-inch, M1, 2020), Qt Creator 6.0.0-beta1 (5.82.0), build 670
It was a bit strange that MacOS did not ask me for a permission for the newly installed QtC6 to access files on my home folder. Maybe the discovery of kits failed on the missing permission? Just a guess...