Bash completion Issue?

I am experiencing (and have for some time) a strange effect with bash completion on my Debian (Unstable) system. Is this a git problem, or something else?

When I type a normal command on the bash command line (say emacs) followed by the partial directory name the completion completes the directory and then adds a slash. If I type a git command (say git update-index) with the same partial directory name it completes the directory, but then adds a space. I have to backspace, manually add the slash, before continuing with the next directory or filename.

In debian, there seems to be a directory /etc/bash_completion.d with files for each of the packages, and the debian git packages have entries in there. So I assume they are derived from the completion work mentioned on this list.

What seems strange to me is that nobody else has mentioned this before now.