MM5 adding songs to playlist opens multiple panels [#16688]

[BenRad]

MM5 has been doing this for me for the last 5 or 6 releases, I'm currently on 2255. Whenever I send songs to a playlist the playlist appears as a panel on the right. If I add another song to the same playlist another panel appears. I've attached a screenshot. Anyone else seeing this? https://photos.app.goo.gl/43j3ZqEDyvm7A6XdA

[Lowlander]

I can replicate: https://www.ventismedia.com/mantis/view.php?id=16688