ListPopupWindow animation starts in textfield instead of below it

I added aListPopupWindow anchored to a TextInputLayout. The issue I have with this is that the animation for the popup starts within the TextInputLayout:

Note that the issue is just where the animation starts. After the animation has finished, the popup is correctly shown below the TextInputLayout.

What do I have to do to let the animation start just below the TextInputLayout? Note that it's not my own animation, but the default one.

Layout snippet:

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="16dp"
    android:layout_marginEnd="16dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="hint" />
</com.google.android.material.textfield.TextInputLayout>

Code for the ListPopupWindow:

val arrAdapter = ArrayAdapter<String>(
        this,
        R.layout.dropdown_menu_popup_item,
        listOf("hello", "world")
)

val listPopupWindow = ListPopupWindow(this).apply {
    anchorView = findViewById(R.id.textInputLayout)
    setAdapter(arrAdapter)
}

findViewById<Button>(R.id.button).setOnClickListener {
    listPopupWindow.show()
}

Code also available on Github: https://github.com/wondering639/stack-listpopupwindow-animation-start

Hint: This is just a reduced test case. I am aware of AutoCompleteTextView, but I really need to manually show a ListPopupWindow.

You can use setEpicenterBounds(Rect) and pass a Rect width the full width but a flat height at the bottom of the anchor.

Obviously the anchor view needs to be already laid out when calling setEpicenterBounds(Rect) because its size is needed, the best place for the call is probably right before show(), if you really can't do it there and the anchor view is not using fixed sizing, you might use a ViewTreeObserver.OnGlobalLayoutListener.

val anchorView = findViewById<View>(R.id.textInputLayout)
val listPopupWindow = ListPopupWindow(this).apply {       
    this.anchorView = anchorView
    setAdapter(arrAdapter)
}

findViewById<Button>(R.id.button).setOnClickListener {
    listPopupWindow.epicenterBounds = Rect(0, anchorView.height, anchorView.width, anchorView.height)
    listPopupWindow.show()
}