Attached images are not displayed when editing an annotation

Follow this steps to reproduce:

• Open an existing wiki page and activate annotations; make sure to use an user that has edit right on that page
• Create a new annotation, uploading a new image in its content
• Save the annotation and check how it is displayed => the image is displayed nicely
• Edit the annotation => the image is displayed as if it is missing
• Check the attachments tab => the image is there, so the annotation display is good; there's a problem with the annotation edit