I just filed a new bug with Microsoft Connect. I certainly hope this one doesn’t get shrugged off like many of my other bugs did.
Want to reproduce it yourselves? Just create a table with a character that can only be valid inside the context of brackets (like a comma or braces) and then try to select from it. Don’t keep the CREATE clauses in the same query window or it might just work. See the screenshot below.
This is very frustrating because this means that not only is there no IntelliSense for these objects, but IntelliSense now gets in the way of actual querying as it will autocomplete incorrect names.