TextArea/TextField selection not properly working on iOS

After selection of text the copy/cut/past popup is not shown on iOS.

Scenario 1:

1. Select part of the text using press and hold.
2. Press and hold on the selected text.
3. The "Copy/Paste" system popup sometimes shortly pops up but immediately vanishes.

Expected behavior: The popup should stay visible.

Scenario 2:

1. Press and hold without text selection.
2. A popup will show. Select the "Select all" option.
3. Press and hold on the selected text.
4. The "Copy/Paste" system popup properly shows up.

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    width: 640
    height: 480
    visible: true
    title: qsTr("Test")

    TextArea {
        id: textField
        selectByMouse: true
        persistentSelection: true

        wrapMode: Text.WrapAtWordBoundaryOrAnywhere

        layer.enabled: true // Qt 5.15.7 bug

        text: "Test 1\nTest2"
    }
}

The problem does not occur in Qt 6.2.2.