Good to know that it’s what you are doing…
but I am not getting the same “vibe” / feeling / behavior as when I Undo on other applications such as Pages, Word or Apple’s built in Notes.
To help you more, I probably would have to take the time to do parallel simulations in Pages and Agenda and see exactly when things defer… I will try to do so. Thanks @drewmccormack for your clarifications. 