Random kit is preselected when opening project in Qt Creator

Qt Creator 4.14.0

Based on Qt 5.15.2 (MSVC 2019, 64 bit)
Built on Dec 17 2020 07:57:20
From revision 909f74dc56

Steps to reproduce:

1. Go to Tools > Options > Kits

2. Make sure there are a couple of kits available. (if not add some manually)

3. If there is no default kit set - leave it as it is.

4. If there is a default kit set - make manual kit default > Apply changes > Remove default kit.

5. The First kit from the list should be shown as default one. 

6. Apply changes and open any example project.

7. Take a look at the selected kits. 

Actual: In my case the third kit from the top was preselected (the first one was marked as default). 'Select all kits' checkbox was not checked.  

Expected: Default kit should be selected. If there is no default kit set or default cannot be used to build particular project - none of the kits should be selected. 'Select all kits' checkbox should be checked (as it is when I select any kit) if there is a default kit preselected.

 See the attached video for more details: qtcreator-bug-kits.mp4