Flutter app BOOT_COMPLETED receiver doesn't work

There have been many questions like this before, and I've tried to implement the answers but it doesn't work on Android 11. I want my flutter app will be started/opened automatically after booting was completed.

this is my receiver MainActivityReceiver.kt

package com.mypackage

import android.content.BroadcastReceiver
import android.content.Context;
import android.content.Intent;

class MainActivityReceiver: BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        if (intent.action == Intent.ACTION_BOOT_COMPLETED) {
            val i = Intent(context, MainActivity::class.java)
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
            context.startActivity(i)
        }
    }
}

and I added some code on AndroidManifest.xml

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

<receiver
            android:enabled="true"
            android:exported="true"
            android:name="com.myPackage.MainActivityReceiver"
            android:permission="android.permission.RECEIVE_BOOT_COMPLETED">

            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="android.intent.action.QUICKBOOT_POWERON" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

  </receiver>

from Flutter app BOOT_COMPLETED receiver doesn't work