Everyone, Testflight issue have been resolved and I have uploaded a new build and it is working fine now. Thanks Apple but wish it was clear earlier that it was a Testflight bug.

It works perfectly, only curious question is that is it fine with Apple as above only they mentioned it is not recommended: | There isn't a recommended approach or API that reverts the TabView style. Please file an enhancement report asking for this behavior using Feedback Assistant and paste the FB number here.