iOS 14 large-title navigation bar doesn’t come back after shrinking

My large title does shrink normally when scrolled, just like it's supposed to. But, it doesn’t come back large again even when I scroll to the top. When I build the project and open the app for the first time, the large title and search bar appear normally but once it shrinks. It doesn't come back before I finish the app. It happens the same on my device as well.

I am using tableView with ViewController, with searchBar in the navigation title. I also have tableview header under the navigation bar.

The way my large title works:

The way it's supposed to work:

I have added a searchController inside the navigation bar, but I don't think searchController is the problem because the same problem happens even when I remove the search bar from my project. Also, I have used the same code making large titles in those two different projects in the GIFs, but one works and one doesn't. Why is it?

I put this in the viewDidLoad() .

navigationController?.navigationBar.prefersLargeTitles = true

I also tried:

navigationItem.largeTitleDisplayMode = .always

But, it didn't work.

I also tried putting:

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

those two in viewWillAppear() but it didn't work as well.

-Edit-

The tableView is the first in the view hierarchy, as well. Please let me know if there's something wrong with the hierarchy.

The image of my document outline:

I looked up what tableview.alwaysBounceVertical is and what bounce is in tableview, and I found out that bounceOnScroll property was set to false, which was the reason this problem occured(I guess). The large title becomes large again when I scroll to the top, after I checked true to bounce on scroll in the storyboard.

Also, the my large title works fine without setting bounce vertically property to true. I tried with both storyboard and in code by setting it to false. So the problem was with only bounceOnScroll, I guess.

In code, it is okay to put

tableview.bounces = true

on the viewController.