Grey background in navigation bar with searchController added to navigationItem during push

I have a table view in navigation controller so that I can push the detail view controller on the stack. It works fine, until I add a search controller to the navigation item, like so:

searchController.obscuresBackgroundDuringPresentation = false
searchController.hidesNavigationBarDuringPresentation = false
searchController.searchBar.delegate = self
searchController.searchBar.tintColor = Colors.mlLabel
navigationItem.searchController = searchController
definesPresentationContext = true

It results in temporary grey background, see below:

When debugging the view hierarchy, it looks like UIViewControllerWrapperView's _UIParallaxDimmingView(selected below) is causing this, as both navigation bar and status bar are transparent.

How can I fix this?

Note: Setting the animated property in pushViewController() to false works, but I'd like to keep the animation.

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