Crash on removal of QLPreviewController and _EXRemoteViewController

I have a controller that displays a pdf using UIDocumentInteractionController as the presented view. When users open it up, it shows fine.

User gets the app backgrounded and session timed out.

After timed out, when the app is brought to foreground, I bring our loginVC by removing the old VC used to show the UIDocumentInteractionController. All the crashes are happening at this point.

I am not able to reproduce it, but our alert systems show we have crashes happening.

The code that shows the pdf is straight forward

    documentViewController = UIDocumentInteractionController()
    documentViewController?.delegate = self
    documentViewController?.url = url
    documentViewController?.presentPreview(animated: true)
 
and we reset it to nil in delegate documentInteractionControllerDidEndPreview
 

Based on the crash trace, it seems like the crash happens when our login VC replaces it and only when pdf was displayed. The reason of stressing ONLY because when we have other viewcontroller present and they are removed in a similar way, we do not see any issue.

So we always replace first and then add a new one

childViewController.willMove(toParent: nil)
    childViewController.viewIfLoaded?.removeFromSuperview()
    childViewController.removeFromParent()

addChild(childViewController)
    view.addSubview(childViewController.view)
    childViewController.view.frame = view.bounds
    childViewController.didMove(toParent: self)

Raised a ticket with Apple, but I haven't heard back, and it's been a month. Posting here in case anyone experiences the same and has any solutions. I saw some related posts, and solution was to remove the pdf the moment the app goes to the background, but I am trying to find some alternate solution if possible.