Note anchored line creates two lines on linked staff

Note sure if this is a bug or a feature so haven't reported on github.

In image I'm making a hold line in the tab staff to show that the low A is a minim and should be held. I did that with two crotchets, adding the line, and hiding the second crotchet. Two lines are created - I've moved the second one and made it invisible.

Also in image, if I select first two A on music staff and add note anchored line, you see a second line that connects to the tab.

Same results for guitar or lute tab. Not a major problem as you can make the second one invisible (but you can only delete both), and it might be better to use a line from the lines palett anyway.