Hello,
I don't know if this issue is specific to 2020.05 version, but I encountered this bug:
When track pane is horizontally zoomed to the max, and project is playing, User Interface become unresponsive and it is impossible to stop playback, nor by the keyboard, nor by mouse.
This is not project specific, the only way to stop playback is to wait the end of project or to kill cakewalk application by the task manager.
Kind regards, Marc.