IssueTracker

I don't think this is enough cause we don't know how it is being produced. If you could create a project that recreates this that would be great, if not please provide us with the steps and we can see if that helps.

It looks like we were using a CopyOnWriteArrayList in the Java version of NavController, which was resilient to removing an OnDestinationChangedListener as part of the dispatch i.e.,

addOnDestinationChangedListener(object : OnDestinationChangedListener {
    override fun onDestinationChanged(
        controller: NavController,
        destination: NavDestination,
        arguments: Bundle?
    ) {
        removeOnDestinationChangedListener(this)
    }
})
// Note, you need to have at least one other OnDestinationChangedListener
// that is added after the one that is removed to duplicate this error

We lost that resiliency when we converted over to Kotlin, hence this error. We need to switch back.