RadioButton не меняются при смене темы при нажатии RadioButton

Question

Я пытаюсь создать страницу настроек, которая позволяет пользователю изменять тему приложения, но по какой-то причине элементы управления не ведут себя так, как они должны:

1. приложение застревает на темной теме все время после нажатия на RadioButton
2. Тема действительно применяется, но оба RadioButton s по какой-то причине проверяются

Деятельность

class SettingsActivity : AppCompatActivity(), SettingsFragment.PreferenceXchangeListener {
    // Initial value for applying appropriate theme
    private var mCurrentValue: Boolean = false // False is default value

    override fun onCreate(savedInstanceState: Bundle?) {
        // Check which theme should be used. IMPORTANT: applying Themes MUST called BEFORE super.onCreate() and setContentView!!!
        val mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(this)
        mCurrentValue = mSharedPreferences.getBoolean("boosted", false)

        if (mCurrentValue) {
            setTheme(R.style.MyDarkSettingsTheme)
        } else {
            setTheme(R.style.MyLightSettingsTheme)
        }

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_settings)


        val viewllSettingsContainer = settings_container

        val root = viewllSettingsContainer.rootView

        if (mCurrentValue) {
            root.setBackgroundColor(Color.BLACK)
        } else {
            root.setBackgroundColor(Color.WHITE)
        }

        val settingsFragment = SettingsFragment()
        supportFragmentManager
            .beginTransaction()
            .replace(R.id.settings_container, settingsFragment)
            .commit()
    }


    // Callback method for changing preference. It's only called if "preference_a" has changed
    override fun onXchange(value:Boolean) {
        // If value differs from previous Theme, recreate Activity
        when {
            mCurrentValue != value -> {
                mCurrentValue = value
                recreate()
            }
        }
    }
}

Фрагмент

class SettingsFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChangeListener,
    Preference.OnPreferenceClickListener {
    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
        addPreferencesFromResource(R.xml.app_preferences)

        findPreference<RadioButtonPreference>("light")?.apply {
            updateCheckedRadioButton(this)
            onPreferenceClickListener = this@SettingsFragment
        }
        findPreference<RadioButtonPreference>("dark")?.onPreferenceClickListener = this
    }

    // Declaring PreferenceXchangeListener
    private var mPreferenceXchangeListener: PreferenceXchangeListener? = null

    // Declare PreferenceXchangeListener to communicate with Activities
    interface PreferenceXchangeListener {
        fun onXchange(value:Boolean)
    }

    override fun onAttach(context: Context) {
        super.onAttach(context)
        // On attach - assign parent Activity as PreferenceXchangeListener
        try
        {
            mPreferenceXchangeListener = context as PreferenceXchangeListener
        }
        catch (e:ClassCastException) {
            Log.e(TAG, "onAttach::::: PreferenceXchangeListener must be set in parent Activity")
        }
    }

    override fun onPreferenceChange(preference: Preference, newValue:Any):Boolean {
        return if (preference.key == "dark") {
            (preference as RadioButtonPreference).isChecked = newValue as Boolean
            // Execute parent Activity's callback with the new value
            mPreferenceXchangeListener!!.onXchange(newValue)
            true
        }
        // check other preferences here
        else false
    }

    private var oldCheckedPreference: RadioButtonPreference? = null

    private fun updateCheckedRadioButton(radioButtonPreference: RadioButtonPreference) {

        // Uncheck the previous selected RadioButton if necessary.
        oldCheckedPreference?.isChecked = false
        radioButtonPreference.isChecked = true
        oldCheckedPreference = radioButtonPreference

    }

    override fun onPreferenceClick(preference: Preference): Boolean {
        if (preference is RadioButtonPreference)
            updateCheckedRadioButton(preference)

        if (preference.key == "dark")
            activity!!.setTheme(R.style.DarkTheme)
            activity!!.recreate()
        else
            activity!!.setTheme(R.style.LightTheme)
            activity!!.recreate()

        return true
    }

    companion object {
        private val TAG = SettingsFragment::class.java.simpleName
    }
}

xml / app_preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory android:title="Application theme">
        <com.companyname.appname.RadioButtonPreference
                android:key="light"
                android:title="Light" />
        <com.companyname.appname.RadioButtonPreference
                android:key="dark"
                android:title="Dark" />
    </PreferenceCategory>

</PreferenceScreen>

anim / fade.xml

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0"
        android:duration="@android:integer/config_mediumAnimTime" />
</set>

Текущий результат