I spoke with apple team and they explained the reason.As per apple, if the app is already in App Store, that is considered as app update. But our MCOM QA target (different app id) has never been to App Store as we use this for internal purpose. So apple considers this as new app when we push to test flight. Unfortunately they couldn't provide any exception and the only solution is to replace all UIWebView with WKWebView.
Dinesh1129
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In my case, both targets should be considered as app updates. But surprisingly, release target is considered as app update and QA target is considered as new app. I have been chasing apple support for one month but the issue is not resolved yet.