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ios - iOS14 navigationItem.largeTitleDisplayMode = .always not work

I have a ViewController and a DetailViewController, in the ViewDidLoad of the ViewController I set the following code, the purpose is to make the ViewController always use the large title

self.navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.largeTitleDisplayMode = .always

In the ViewDidLoad of the DetailViewController I set the following code, the purpose is to make the DetailViewController not use the large title

navigationItem.largeTitleDisplayMode = .never

When I return from DetailViewController to ViewController, the small title is displayed instead of the large title in ViewController. This code is correct in iOS12 and iOS13. How to make the ViewController always display the large title on iOS14?

Currently using Xcode12 from the App Store

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For iOS 14, need to add sizeToFit function. Below code always work.

navigationController?.navigationBar.prefersLargeTitles = true
navigationController?.navigationBar.sizeToFit()

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