This can be reproduced by copying for instance icons from https://www.flaticon.com/packs/content-management-system-4?word=open%20source . When switching to Source the following HTML
<ul><li><p><span><!--startimage:false|-|attach|-|2956546.png--><img alt="" src="/xwiki/bin/download/Sandbox/Foo/WebHome/2956546.png" /><!--stopimage--></span><a href="https://www.flaticon.com/free-icon/cms_2956546"> </a></p></li><li><p><span><!--startimage:false|-|attach|-|2956557.png--><img alt="" src="/xwiki/bin/download/Sandbox/Foo/WebHome/2956557.png" /><!--stopimage--></span><a href="https://www.flaticon.com/free-icon/open-source_2956557"> </a></p></li><li><p><span><!--startimage:false|-|attach|-|2956444.png--><img alt="" src="/xwiki/bin/download/Sandbox/Foo/WebHome/2956444.png" /><!--stopimage--></span><a href="https://www.flaticon.com/free-icon/accessibility_2956444"> </a></p></li></ul>
gets converted to:
* ((( [[image:2956546.png]][[url:https://www.flaticon.com/free-icon/cms_2956546]] ))) * ((( [[image:2956557.png]][[url:https://www.flaticon.com/free-icon/open-source_2956557]] ))) * ((( [[image:2956444.png]][[url:https://www.flaticon.com/free-icon/accessibility_2956444]] )))
