Steps to reproduce the issue

Add an image into your content using the CMS Content -> Image feature in TinyMCE

Add the Image Description, Image Class, Figure Class and Figure Caption and enabled lazyloading

Save the article.

Change your mind and return to the article.

Instinctively double click the image to edit its details.

Expected result

A user experience that is easy to use for Joomla Content Admins to modify image information previously easy to edit.
A web interface to modify things that were previously input in a web based form interface.

Actual result

Cannot edit previously added images Image Description, Image Class, Figure Class and Figure Caption or enable/disable lazy load without editing HTML source code in View Source mode.