Repro:
Go to toolbox
Click play on an audio track
Close the toolbox
Audio will continue playing even though the toolbox has been closed. To make it stop playing you need to manually re-open the toolbox and stop the song there. It should stop playing on it’s own as soon as the toolbox is closed.
The next spotify has been found
Not a bug. It’s a secret feature. Keep it quiet.
Hard to keep it quiet when it keeps playing
Serious reply: I also confirm this is an issue (obviously easy to reproduce).
ALSO this exact issue applies to the Properties tab too.
Sounds in the library on the site still don’t play 
Ummm you know you can click the pause button right XD lmao…
That’s the entire issue: If you close out of the toolbox/property window, that Pause button is no longer there for you to click. Therefore, the expected behavior should be to stop the sound if the window is closed.
Mmm true but it can’t be that hard to click pause…
It’s a bug and we should be glad it’s been reported. It doesn’t matter how easy or hard it is to remember to click pause
Mk I guess so.