Images not showing on the frontend but works fine in the backend/builder

When using Firefox, the images I select in the builder shows fine in the Divi builder, but when I get to the frontend of WordPress to see the page, the before/after is not rendered.

The plugin seems to work fine with Chrome.

I also found these related bugs:

• If you do not use full size images (i.e. selected via media manager), the Divi modules content will not be outputted.
• If you use webp images,the Divi module’s content will not be outputted.

Further information

• Firefox – It is hit and miss as to whether the images will display on the frontend. When you rule out the 2 issues above the render() code is always shown, but the frontend translation to the before/after effect does not work every time. This must be a JavaScript to do with when it is triggered by the related event is.
• I have sent an email with much more detailed information the developer.