TC: 8.51b2 (but was present before)
open an ftp connection (a STORED one, complete with stored password)
Bookmark an ftp folder (Ctrl-D or '*', it doesn't matter)
close ftp connection
try to use Ctrl-D to re-open the connection.
password is asked again, if you use folder's history (Alt-Down or similar), the ftp site and folder are re-opened without password requirements.
I don't know if it's by design or it's my fault.

Marco.