Both buttons are checked in MaterialToggleButton Android while only one should

I have a MaterialButtonToggleGroup like this

<com.google.android.material.button.MaterialButtonToggleGroup
            android:id="@+id/toggleGroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            app:singleSelection="true">

            <com.google.android.material.button.MaterialButton
                android:id="@+id/bYes"
                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="YES" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/bNo"
                style="@style/Widget.MaterialComponents.Button.OutlinedButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="NO" />
        </com.google.android.material.button.MaterialButtonToggleGroup>

I am listening to the changes happening on this ToggleGroup like this

toggleGroup.addOnButtonCheckedListener { group, checkedId, isChecked ->
//            println("checkedId ${checkedId} $isChecked")
            if (checkedId == R.id.bYes){
                println("yes is checked "+1)
            }else{
                println("no is checked "+0)
            }
        }

But what's happening is, both buttons are checked when I am just switching from YES to NO. I am getting the logs like this

I/System.out: yes is checked 1
I/System.out: no is checked 0

whenever I switch from YES to NO. Shouldn't this only give me the button that is checked not the button that is unchecked?

Any help would be appreciated.

You have to filter the checked button with the isChecked flag:

toggleGroup.addOnButtonCheckedListener { group, checkedId, isChecked ->
    if(isChecked) {
        when(checkedId) {
            R.id.bYes -> println("YES is checked")
            R.id.bNo -> println("NO is checked")
        }
    } else {
        when(checkedId) {
            R.id.bYes -> println("YES is not checked")
            R.id.bNo -> println("NO is not checked")
        }
    }
}