Images from an office document are not displayed in the WYSIWYG editor after an import

Edit a page (any page besides Main.WebHome) using the WYSIWYG editor and import an office document that has at least one image. The text is displayed in the rich text area after the import but not the image.

Actually, if you inspect the HTML you can see that the image URL is wrong, pointing to Main.WebHome page instead of the edited page. The image URL is fine though in view mode, after the page is saved.