Thats cool! I'm not sure where it comes from, but I get similar behavior in zsh with 'cd ....' - similar doesn't happen in bash though.

I mapped 'cd' to 'c' in my bashrc, but while doing it I also mapped 'c' to execute 'ls' as the latter was basically muscle memory whenever I was using cd. The .bashrc function looks like this:

c() { builtin cd "$@" && ls; }