Undo not possible, when data is changed in the timeline?

Q & A - getting started with Tinderbox
1

Hi there.

“undo” seems to be not working, when I changed a date by dragging items around in the timeline.
Is this correct behavior?
When I enter the data directly, undo works as expected.

2

Undo works for me after dragging items in Timeline.

I’m not completely certain whether changing the duration of an event in timeline is undoable.