Image width not correct in mobile view

[Frolipon]

When an image has a fixed width in desktop with a class to set a different width in mobile, the mobile view is not rendering the correct width.
Example:
In desktop the image is 250px width:

In mobile, there is a class setting the width of the image at 100%. So the rendering should be:

But in the mobile preview of the WYSIWYG edition, the mobile rendering is as follow:

The final downloaded HTML is correct, so the problems is only in the mobile view of the editor.

Here is an example:
https://badsender-stage-eu.herokuapp.com/editor/608fa8a599e70d003b606ab5