[AutoTest] Invoking Qt Tests freeze UI and crash

I have installed the qtc10.beta to try it and I have to revert back to the qtc9, I have ~2200 Qt tests in 28 test cases and if I invoke all tests, UI starts freezing and I also had a crash (it crashed once out of 20 tries?, so very occasionally), after that crash I have reverted back to qtc9.

It's hard to describe this kind of issue but in qtc 9 it's like papapa test by test smoothly, you practically see every test that is invoked, in qtc10 it's not like papapa, it executes some amount of tests eg. 500 then UI freeze then unfreeze and again and again, I think tests are still invoking in the background during the UI is frozen? Hard to tell. UI freezes are very quick sometimes and sometimes can take a few seconds, on Windows a whole qtc window fades to white color with a circle cursor.

I have compiled qtc with the AutoTest plugin in the Release mode and tried to revert the 458544: AutoTest: Widen scope for run under cursor commit and it doesn't cause this problem, I can still reproduce it even after reverting.