At first, I could not reproduce this. I followed the steps in the video, but as soon as I selected the last note to drag it, the other notes all de-selected.
Next, I checked in Preferences to see if there were any editing settings which I could change. Once I had turned on the two options for Mouse Input (which I normally NEVER use), the crash occurred when I tried dragging the notes.
I don’t know if both need to be checked for the crash to occur or if only one of them is the culprit.