"Duplicate to Staff Below" overwrites simultaneous PT

In this example, I’m entering a downbow, then using Ctrl-Alt-M to duplicate it to staff below (my own key command).

But when I do, it erases the arco PT. I can click on the note itself and add the downbow, but I’m not able to use the Duplicate command.

EDIT: I see it only happens when the downbow has a duration. Not sure if that is the intended behavior.

Copy and paste overwrites items of the same kind at the same position as of Dorico 3.1, so this would be the expected behaviour. Whether or not it’s always useful is another matter!

I’m definitely a fan of this functionality for dynamics, but PT often need to get stacked. Just my two cents!