When I have a harp harmonic in the right hand, the left hand will playback all notes as harmonics until there's a nonharmonic note in the right hand, even though harmonics are not specified in the left hand. In the graphic below, I'll play harmonics for the left hand in measures 2 and 4 when it's not indicated to do so. Curiously, it'll play measure 3 with the correct playback. It seems to depend on if there's a harmonic in the right hand that precedes the left hand or if it's a normal note (non-harmonic). I have no idea why and it's driving me crazy! (I'm on a Mac Big Sur 11.5.2 - Finale 27.2.0.142.)