1 `\[[!debbug 123456]]` expands to "bug #123456", which is hyperlinked. Could you please drop the leading "bug", for two reasons?
3 First, #123456 is not a bug, it's a bug report. And second, #123456 suffices, doesn't it? By hardcoding the "bug" in there, you make it impossible to start a sentence with a bug number, e.g.:
5 There are problems with code. #123456 is a good example of...
9 There are problems with code. bug #123456 is a good example of...