out of 6 that I have with right field workshops, this is the only one that broke the legend.
besides workshop placements there is also a lot of variation with the dots, if any, like XXIHP versus • XXI•HP• or something like XXIΓ•ΛI• and •Γ•XXI•ΛI• which moves around the workshop but is not consistent with dot usage.
I also pay attention to parallel and divergent ties, though I have not noticed much of a pattern, if any...maybe just random whim of the engraver.