Hi Richard, > I guess this means it is not a well-known feature.
Not well-known, likely… but sure seems like a bug and not a feature to me. =) > Does anyone have an idea if there are guidelines which suggest > what choice should be made? It is traditional to place ties on whole notes as if they had stems: above if the stems would go down, below if the stems would go up. So the question here reduces to the question of which side the stems would be on [if there were stems]? For middle-line notes, there is no strict rule… but there is a general consensus that stems shouldn't flip unnecessarily. That means in this case, the stems would/should go down, and thus the ties would [all] be above. Hope that helps! Kieren.