How long does the proximity sensor work on iPhone devices with dynamic islands?

On iPhone devices with dynamic islands (e.g. iPhone 15 Pro Max), the proximity sensor takes about 3 seconds to activate, is this normal?

The iPhone 13 responds almost instantly, but the iPhone 15 Pro Max seems to take a while.

class ProximitySensorManager {
    
    // Shared instance for global access (optional)
    static let shared = ProximitySensorManager()
    
    // Proximity sensor activation flag
    private(set) var isSensorEnabled: Bool = false
    
    // Start observing proximity sensor changes
    func enableProximitySensor(observer: Any) {
        guard !isSensorEnabled else { return }
        isSensorEnabled = true
        UIDevice.current.isProximityMonitoringEnabled = true
        
        NotificationCenter.default.addObserver(
            observer,
            selector: #selector(proximityStateChanged),
            name: UIDevice.proximityStateDidChangeNotification,
            object: nil
        )
    }
    
    // Stop observing proximity sensor changes
    func disableProximitySensor(observer: Any) {
        guard isSensorEnabled else { return }
        isSensorEnabled = false
        UIDevice.current.isProximityMonitoringEnabled = false
        
        NotificationCenter.default.removeObserver(
            observer,
            name: UIDevice.proximityStateDidChangeNotification,
            object: nil
        )
    }
    
    // Proximity sensor state change handler
    @objc private func proximityStateChanged() {
        if UIDevice.current.proximityState {
            print("Proximity sensor detected close object")
            // Additional functionality can be added here (e.g. lowering the screen brightness)
        } else {
            print("Proximity sensor detected no object")
        }
    }
    
    deinit {
        //disableProximitySensor() // Clean up observer on deinitialization
    }
}