Need help fixing Playtime Window with SRD_MenuBackgrounds

[TheDrifter]

Hi,
I've created a brand new Test project with only two plugins in it:

Playtime Window from JGreene found here.

Spoiler: Plugin

// MenuPlaytime.js

/*:
 * @plugindesc Provides a playtime window for your menu. Works with Yanfly Engine Plugins.
 * @author JGreene
 *
 * @help Place this plugin below all of Yanfly's Plugins in your load order.
 */

(function() {

    var _Scene_Menu_new = Scene_Menu.prototype.create;
    Scene_Menu.prototype.create = function() {
        _Scene_Menu_new.call(this);
        this._statusWindow.x = this._commandWindow.width;
        this._statusWindow.y = 0;
        this.createPlaytimeWindow();
        this._goldWindow.x = 0;
        this._goldWindow.width = this._commandWindow.width;
        this._goldWindow.y = Graphics.boxHeight - this._goldWindow.height;
    };
    
    // Refresh playtime window
    
    Scene_Menu.prototype.update = function() {
        Scene_Base.prototype.update.call(this);
        this._playtimeWindow.refresh();
    }
    
 // Playtime window
    
    Scene_Menu.prototype.createPlaytimeWindow = function() {
    this._playtimeWindow = new Window_Playtime(0, 0);
    this._playtimeWindow.width = this._commandWindow.width;
    this._playtimeWindow.x = 0;
    this._playtimeWindow.y = Graphics.boxHeight - (this._playtimeWindow.height*2);
    this.addWindow(this._playtimeWindow);
    };
    
    function Window_Playtime() {
        this.initialize.apply(this, arguments);
    }
    
    Window_Playtime.prototype = Object.create(Window_Base.prototype);
    Window_Playtime.prototype.constructor = Window_Playtime;
    
    Window_Playtime.prototype.initialize = function(x, y) {
        var width = this.windowWidth();
        var height = this.windowHeight();
        Window_Base.prototype.initialize.call(this, x, y, width, height);
        this.refresh();
    };
    
    Window_Playtime.prototype.windowWidth = function() {
        return 240;
    };
    
    Window_Playtime.prototype.windowHeight = function() {
        return this.fittingHeight(1);
    };
    
    Window_Playtime.prototype.refresh = function() {
        var x = this.textPadding();
        var width = this.contents.width - this.textPadding() * 2;
        this.contents.clear();
        this.drawText(this.value(), x, 0, width);
    };
    
    Window_Playtime.prototype.value = function() {
            return $gameSystem.playtimeText();
    };
    
    
    Window_Playtime.prototype.open = function() {
        this.refresh();
        Window_Base.prototype.open.call(this);
    };

})();

and SRD_MenuBackgrounds from SumRndmDde found here.

I've set up the Menu Backgrounds correctly:
As required, in the Test project's image folder, I created a folder called "SumRndmDde", which holds a folder called "menu" that has a single image in it.

In the editor's plugin settings for SRD_MenuBackgrounds, I made every preset parameters be the same:

However, for some reason, the background image doesn't scroll like it should on the Main Menu screen where the timer is shown.

It does work and scroll correctly everywhere else.

How may I fix this?
Thank you very much for your help!