I think there is nothing that prohibits this function on ground, too. Except that usually the airplane doesn´t climb or descend much when on the ground .
However - if you are RIGHT on the edge of triggering this function, and the pressure changes, or you taxi downhill, or the plane settles a foot during "spawning", you might very well get this alert.
I am not sure why you can´t enter V-speeds after that, it might be a different bug (unable to access TAKEOFF REF page) - we have yet to investigate the erroneous switch to "air mode" while the plane is still on the ground. Likely an initialization problem, like Tom suspected.
Jan