That's correct. The "problem" I think is because when you forward without editing the message is build on its "final form" and so no more editing is allowed. My bet is that David H. didn't find useful to refresh the queue pane to show it. It would be nice though as the user could confirm his action was correctly performed.
And as mentioned behind, closing and opening the queue pane will show (refresh) the forwarded message waiting for the next polling.
Pegasus Mail 4.73.639 - Windows 7 Ultimate
BearHTML 126.96.36.199 - Virscan 188.8.131.52