Certain sounds continue after their clones are deleted

[Robomandude]

Expected Behavior

In scratch 2.0 if you delete a clone while it is busy executing a [play note for beats block], or a [play sound until finished] block, the sound cuts off.
This is useful for when you don't know in advance how long to play a note or if you don't want to play the entire sound.

It should be noted that [play sound] (now known as [start sound]) plays to completion regardless even in scratch 2.0

Actual Behavior

The sounds (and/or notes) continue to completion regardless of whether or not the clone is deleted partway through.

Steps to Reproduce

Create a script:
[When I start as clone]
[play note 60 for 10 beats]

Create another script:
[When I start as clone]
[rest for 2 beats]
[delete this clone]

Then create a clone.

Operating System and Browser

Windows 7
Google Chrome Version 67.0.3396.99 (Official Build) (64-bit)

[Robomandude]

Oh a good use for this edge case behavior is demonstrated here: https://llk.github.io/scratch-gui/develop/compatibility-testing.html#237931636

[TheLogFather]

This is likely a dup of scratchfoundation/scratch-vm#1410 (though that mentions only sounds – the principle is the same, in that it's to do with Scratch 2 stopping sounds/notes playing in scripts that get terminated, and which Scratch 3 no longer does).

[thisandagain]

Tracking in scratchfoundation/scratch-vm#1410