I just saw this issue happen twice yesterday, but in the latest official release (rather than the Access/Beta). So it seems like the issue may have been there already, though it’s an interesting coincidence that it just happened to me.
I was zoomed in quite a lot in the track view, and with the gain envelope showing. After pressing play, my requests to stop were ignored for about 15 seconds. The screen was not responsive though it did continue scrolling in the timeline as well as playing back perfectly fine.