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Gray shadow on UINavigationBar

I am having a strange problem when I go to the UIViewController that I made. The ViewController B (the one I'm going to) has a UIView that slides down using a TransitionCoordinator and restrictions, but it shows a gray shadow on the right:

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Once the segue is fully completed, it returns to translucent and displays a blue UIView through the UINavigationBar with a nice blur.

This gray shadow is most likely related to the UIToolBar and UISegmentedControl inside this toolbar in the UITableViewController that I'm switching from. It looks like this:

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I use this code along with my UIToolBar:

- (UIBarPosition)positionForBar:(id<UIBarPositioning>)bar {
    return UIBarPositionTopAttached;
}

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