BUG: Background image preview not displayed in the editor widget

[riklaunim]

GrapesJS version

• I confirm to use the latest version of GrapesJS

GrapesJS MJML version

• I confirm to use the latest version of GrapesJS MJML

What browser are you using?

Any

Reproducible demo link

https://grapesjs.com/demo-mjml.html

Describe the bug

How to reproduce the bug?

1. Drag Hero widget somewhere on the page
2. Select it and go to style manager, decorations - the "Background url" widget will allow to remove or change it but will not show any preview of the image (the preview DIV remains empty).

This also happens on any other element allowing a background image.

What is the expected behavior?
Image preview visible

What is the current behavior?
Image preview missing

Code of Conduct

• I agree to follow this project's Code of Conduct