Edited: Analysis and Solution Idee in Comments

HUAWEI Tablet does not support TOUCH as expected by TapHandler with GesturePolicy set to ReleaseWithinBounds. The pressed flag is set as expected, but the active flag (explicit grab) is not working reliable.

Used device: HUAWEI MediaPad M3 Lite 10 (BAH-L09 / Android 7.0, EMUI 5.1.3)
iPhones, Pixel and Sony Android Phones all work as expected.
 

import QtQuick 2.13
import QtQuick.Window 2.13

Window {
    visible: true;  width: 100; height: 100

    Rectangle {
        anchors.fill: parent

        color: {
            if(tapHandler.active)
                return "red";
            if(tapHandler.pressed)
                return "yellow";
            return "green";
        }

        TapHandler {
            id: tapHandler
            gesturePolicy: TapHandler.ReleaseWithinBounds
        }
    }
}

Video attached
Left is a Pixel 3. Right is the HUAWEI. Expected is Green-Red. Yellow should never be visible.