thanks for pointing out this issue! We fixed it in the engine and it will be available tomorrow for Pro customers with the daily build. For the users on the Free plan, it will be available with release 1.4. Please have a look at the blog post about daily builds we will publish later today, to get more info how to activate them.
As a temporary fix for this problem, you could set the width of your level to parent.width and the height to parent.height, instead of using the anchors.fill: parent.
NOTE: I modified your QML code to be formatted with indentations and added the //FIX to the relevant code.