It is as if the arpeggio code doesn't notice the staff change. Here is a workaround which doesn't prevent a collision but disguises it. Insert a transparent breathing sign after s2 in the right hand: \once \override BreathingSign #'transparent = ##t \breathe Cheers, Robinthe arpeggio sign collides with the a'4 natural of the treble
<<attachment: breathe.png>>
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