Touch device problem in JS

I have the code

   let im = runtimeScene.getGame().getInputManager()
   let usetouch = runtimeScene.getVariables().get("touch_supported").getAsBoolean()


    let tstarts = im.getStartedTouchIdentifiers();

on mobile screen later. Where the usetouch is 1 or true and I have retrieved the var touches and show on the textbox and they are always 0 while I have all my fingers landed on the screen firmly.
The script is located at onScenePreEvents
I have looked into Mouse and touch [GDevelop wiki] and the Test Cases on GDevelop/GDJS/tests at master · 4ian/GDevelop · GitHub but no lucks.:issac:

I have tried both on chrome mobile and firebox mobile. They dont work at all…