XR Interaction Toolkit

Hi, can you try this one out. It works for me.

   bool RayHitUI()
     {
         //Create the PointerEventData with null for the EventSystem
         PointerEventData ped = new PointerEventData(null);
         //Set required parameters, in this case, mouse position
         ped.position = Input.mousePosition;
         //Create list to receive all results
         List<RaycastResult> results = new List<RaycastResult>();
         //Raycast it
         graphicRaycaster.Raycast(ped, results);
 
         if (results.Count > 0)
         {
             return results.Any(r => r.gameObject.layer == LAYER_UI);
         }
         return false;
     }
 void update(){
 
 if( RayHitUI() ){
    //Ignore the cast
 }
 }

Have you attached the 'Tracked Device Graphic Raycaster' script?