I thought maybe the square brackets in the info section were annoying... but you already had that before, and I tested it on one of my permissions... no problem.
The location of the added section doesn't matter either... I've looked at all the files, and there's really nothing to complain about.
You've probably restarted several times by now. The folder structure is probably fine... Permissions/Groups + Areas + default.json... (why would you have changed it anyway?)... Try adding the map and image sections to the admin.json and see if they're listed.