After UIHostingViewBase is added, View will not update for state change

[Kyle-Ye]

Normal path:
state change -> ... -> UIHostingView.layoutSubview

But it will not after #399 .

UIHostingView.layoutSubview is requested by requestUpdate -> setNeedsLayout.

With the new version, due to updatesAtFullFidelity is wrongly evaluated as false due to sceneActivationState is nil, the update is broken with a simple return.