BUG: redo doesn't restore image

### GrapesJS version

- [X] I confirm to use the latest version of GrapesJS

### GrapesJS MJML version

- [X] I confirm to use the latest version of GrapesJS MJML

### What browser are you using?

Chrome v132

### Reproducible demo link

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

### Describe the bug

Hello, I have come across a bug with image restoration.

Steps to reproduce:

1. Add an image.
2. Set the image to a custom one.
3. Click "undo".
4. Click "redo".

Current behavior: the image doesn't come back.
Expected result: the image is restored.

Note: This is only the case with `mj-image` in [GrapesJS MJML](https://grapesjs.com/demo-mjml.html), normal images in the [main demo](https://grapesjs.com/demo.html) work correctly.

Thank you for your time and a great library :)

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct