Rich Text editor loses shortcut content if shortcut link has an alias

I have a shortcut declaration that allows me to link to bugs in our internal bug tracking system, named tswww.

The shortcut is defined as: http://tswww.edgility.com/s/lookup?number=
With the alias set to: %s

To look up a bug, I enter the following for the shortcut:

[1-1C42E2@tswww]

Where the number at the beginning is the bug number.

However, since my upgrade to Confluence 2.7, the Rich Text editor removes the bug number in the markup. Everything is fine if I edit in the Wiki Markup editor, entering the link as shown above. When I transition to the Rich Text editor, the bug appears as the bug number (as expected). However, when I transition back to the Wiki Markup editor or save the page from the Rich Text editor, the link turns into the following:

[@tswww]

I notice that everything works correctly if I remove the alias (%s) from the shortcut link.