on iOS: native volume UI stop working after calling clearWatch()

[zangi-dev]

Describe the bug
on version 6.0.1 after calling closeWatch() the native volume UI is not visible anymore inside the app. I need to restart the app to see the volume UI again.

To Reproduce
Steps to reproduce the behavior:

1. Press Volume button - native UI is showing
2. startWatch
3. Press Volume button - native UI is not showing (correct)
4. clearWatch
5. Press Volume button - native UI is not showing (not correct)

Expected behavior
at point 5 the native UI should come up

Smartphone (please complete the following information):

• Device: iPhone 11
• OS: 18.3.2
• Plugin Version: 6.0.1

Additional context
If I modify the stopHandler in VolumeButtonHandler.swift like this

public func stopHandler() {
        guard isStarted else { return }
        isStarted = false
        volumeView?.isHidden = false
        self.observation = nil
        NotificationCenter.default.removeObserver(self)
        try? session?.setActive(false) // <-- Add this line
        DispatchQueue.main.async { // <-- Add this line
            self.volumeView?.removeFromSuperview() // <-- Add this line
        } // <-- Add this line
    }

the native volume ui start showing again at point 5. The problem is that if I start watching again the native UI still shows.

Android work as expected. Thanks!