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mouse events not working


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Is there a custom way of defining mouse events in babylon-3.1.0?

In babylon.3.0.0 adding mouse events works fine, but in babylon-3.1.0 I can't add mouse down event. Mousewheel still works.

Example code: (just switch between the libraries)

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

      <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        html, body {
            overflow: hidden;
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;

	    <script src="/js/babylon-3.0.0.min.js"></script>


 		<canvas id="renderCanvas" style="width: 100%;height: 100%;" touch-action="none"></canvas>
	  window.addEventListener("mousedown", md);
	  window.addEventListener("mousewheel", mw);
	function md() {
	function mw() {
	var canvas = document.getElementById("renderCanvas"); // Get the canvas element 

    var engine = new BABYLON.Engine(canvas, true); // Generate the BABYLON 3D engine

    /******* Add the create scene function ******/
    var createScene = function () {

                // Create the scene space
                var scene = new BABYLON.Scene(engine);

                // Add a camera to the scene and attach it to the canvas
                var camera = new BABYLON.ArcRotateCamera("Camera", Math.PI / 2, Math.PI / 2, 2, BABYLON.Vector3.Zero(), scene);
                camera.attachControl(canvas, true);

                // Add lights to the scene
                var light1 = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 1, 0), scene);
                var light2 = new BABYLON.PointLight("light2", new BABYLON.Vector3(0, 1, -1), scene);

                // Add and manipulate meshes in the scene
                var sphere = BABYLON.MeshBuilder.CreateSphere("sphere", {diameter:2}, scene);

                return scene;

        /******* End of the create scene function ******/    

        var scene = createScene(); //Call the createScene function

    engine.runRenderLoop(function () { // Register a render loop to repeatedly render the scene




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