That's exactly the problem, iOS 14 is not supported on Sonoma and doesn't work without it. But the Unit testing should be working fine in any iOS Simulator.

@myuncle Thanks for the reply, I came across this thread while I was searching for a solution for this problem. I'm aware it's not supported, but there has to be a fix for this without using iOS 14. The issue is it's not working on other than iOS 14 but it should be working fine.