title: Position issue back button in Root UINavigationController
body: <p>I'm comming to you with a very weird issue I'm facing and I'm not able to solve.</p>
  <p>Assuming I've this pattern in my app (which is pretty common)</p>
  <pre><code>                     ...
                     ↗︎ UINavigationController (1)
  UITabBarController → UINavigationController (2)
                     ↘︎ UINavigationController (3)
                       ...
  </code></pre>
  <p>I'm facing an issue on launch with the very first UINavigationController stack (3) : the back button item goes under the iPhone time (in the iPhone X / XS / 11 ) notch.</p>
  <h2>Issue (right after launch)</h2>
  <p>First controller of UINavigationController
  <a href="https://i.stack.imgur.com/O00u4.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O00u4.jpg" alt="enter image description here" /></a>
  Second controller of UINavigationController
  <a href="https://i.stack.imgur.com/Ke3ro.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ke3ro.jpg" alt="enter image description here" /></a></p>
  <p>If I change the initial tab (to (1) or (2) by example), the issue moves to this tab.</p>
  <p><strong>But</strong> the weirdest here, is that if I navigate into my app (i.e. go to another tab), and then come back, the issue have gone and the back button is at it right position</p>
  <h2>Expected behavior (after navigating)</h2>
  <p><a href="https://i.stack.imgur.com/bNtRc.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bNtRc.jpg" alt="Good position" /></a></p>
  <h2>Things I've tried</h2>
  <p>Changing <code>collectionView.contentInsetAdjustmentBehavior</code> don't help either.
  <a href="https://i.stack.imgur.com/Gylm6.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Gylm6.jpg" alt="Changing contentInsetAdjustmentBehavior" /></a></p>