Reading a PSSliderSpecifier value in Settings Bundle

I didn't know that Settings Bundle exists till two days ago. Anyway, I've tested it with a simple example. As shown in the screenshot below, I have one group, one text field, one slider and two toggle buttons.

I am able to read the values from all of them except the slider. I wonder if it's a bug? I'm using Xcode 14.2. In the following code, the app won't go inside the if clause for the PSSliderSpecifier key.

import UIKit

class ViewController: UIViewController {
	// MARK: - Life cyle
	override func viewDidLoad() {
		super.viewDidLoad()
		
		let defaultValues = [String: AnyObject]()
		UserDefaults.standard.register(defaults: defaultValues)
	}
	
	override func viewDidAppear(_ animated: Bool) {
		super.viewDidAppear(animated)
		
		/* settings */
		fetchSettingBundleData()
	}
	
	@objc func fetchSettingBundleData() {
		let userDefaults = UserDefaults.standard
		if let settingsURL = Bundle.main.url(forResource: "Root", withExtension: "plist", subdirectory: "Settings.bundle"), let settings = NSDictionary(contentsOf: settingsURL), let preferences = settings["PreferenceSpecifiers"] as? [NSDictionary] {
			var defaultsToRegister = [String: Any]()
			for preferenceSpecification in preferences {
				if let key = preferenceSpecification["Type"] as? String, let value = preferenceSpecification["Title"] {
					defaultsToRegister[key] = value
				}
			}
			userDefaults.register(defaults: defaultsToRegister)
		}
		
		if let groupName = userDefaults.string(forKey: "PSGroupSpecifier") {
			print("Group name: \(groupName)")
		}
		if let _ = userDefaults.string(forKey: "PSTextFieldSpecifier") {
			if let text = userDefaults.string(forKey: "name_preference") {
				print("Textfield \(text)")
			}
		}
		if let _ = userDefaults.string(forKey: "PSToggleSwitchSpecifier") {
			if let value = userDefaults.string(forKey: "enabled_preference1") {
				print("Toggle \(value)") // 0 or 1
			}
		}
		if let _ = userDefaults.string(forKey: "PSToggleSwitchSpecifier") {
			if let value = userDefaults.string(forKey: "enabled_preference2") {
				print("Toggle2 \(value)") // 0 or 1
			}
		}
		if let _ = userDefaults.string(forKey: "PSSliderSpecifier") {
			print("heck....") // No show
			if let value = userDefaults.string(forKey: "slider_preference") {
				print("Slider \(value)")
			}
		}
	}
}