this is definitly NO bug.
Because Stateless SB have no "State" JBoss can recycle them after each call.
Not sure if I get your reply echon. According to my knowledge and to the SUN J EE specification the stateful beans should stay valid until destruction and the stateless beans should be reset after each method call and not vice-versa. For some reason in my current installation the stateless beans do HAVE a state while the stateful don't.