downloadAttachment failed for plugin [zipexplorer]: null

1. Create a new entry in http://localhost:8080/xwiki/bin/view/Menu/
2. Attach an image to the new menu page you created.
3. Open the menu page in Inline edit mode, switch to Source and add:
[[image:ImageName.extension||alt="loading" height="5%" width="5%"]][[Home>>Main.WebHome]]
4. Set MENU DISPLAY LOCATION > After the page header
5. Save the page.
6. Click on the xwiki logo to go back to the home page.
7. Check the console logs.

Actual result:

• After step 5 > the image will be displayed in the top menu bar only on this menu page.
• After step 6 > the image will be displayed as missing / broken
• After step 7 > you will see in the console this warning:

  2016-05-17 11:35:49,501 [http://localhost:8080/xwiki/bin/download/Menu/WebHome/Westconf1.png] WARN  c.x.x.p.XWikiPluginManager - downloadAttachment failed for plugin [zipexplorer]: null
  

Expected result:

• When I insert an image in the menu (not an icon defined in xwiki by default) and set it with global visibility, I expect to see the image on all the pages of that wiki, not only on the menu page.