Override field Spinner doesn't work on production app

Hi, I'm working on

framework:

Sencha Touch 2.4.x

I create a spinner override as described in this conversation.

In order to reproduce the problem, I created the Override I click on the component with the right button and the click on "Create override for this class"

The ovverride created a file /app/override/field/Spinner.js

The code was:

Code:

Ext.define('MyApp.override.field.Spinner', {    override: 'Ext.field.Spinner',
    applyValue : function(value) {
        value = parseFloat(value);
        if (isNaN(value) || value === null) {
            value = this.getDefaultValue();
        }
        return this.callSuper([value]);
    }
});

SA change app.json file adding

Code:

"js": [
    ...
    {
       "path": "app/override/field/Spinner.js",
       "x-compile": true
    },


    ...
 ],

nothing more.

When I launch the command "sencha app build production" there is an error in the app:

Code:

Error evaluating http://ift.tt/1BrG3Sr with message: TypeError: undefined is not a function

To fix the problem I had to remove the line from app.json file and add the required file in app.js file

Code:

Ext.application({
    name: 'MyApp',


    requires: [
        'Ext.MessageBox',
        'MyApp.override.field.Spinner'
    ],
    
    //...
});

Do you thing it's a SA bug o I did something wrong when I added the Override?

Thanks for your support.

Regards

Override field Spinner doesn't work on production app