On platforms where one can select and interact with accessibility items via tap (iOS/Android), I find it almost impossible to toggle a QtQuick.Controls CheckBox with VoiceOver/Talkback enabled. I can select the checkbox including the actual checkbox and the text as expected, but when I double-tap the button to toggle, it almost never triggers the toggle. I've seen it work a few times, as if the area reacting is very tiny, like a few pixels.

When manually setting Accessible.onPressAction: toggle(), it behaves as I would expect.
I think this should be the default. Native controls on both platforms behave like this.

import QtQuick
import QtQuick.Controls

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    CheckBox {
        id: checkBox

        anchors.centerIn: parent
        text: "Hello World"
        Accessible.onPressAction: toggle() // Without this, it's almost impossible to toggle the checkbox
    }
}