Posting this here instead of a new thread since these rectangle terraforming issues all seem to be related. If I try to edit any of my rectangles, after I click with the brush just once the rectangle dimensions change and completely mess up the elevations. The same happens even if I uncheck and recheck the new Force elevation option.
Undo is not possible. The only option is to hit “Load this asset group” or close and reopen the project to start over from your last save.
I split your posts into a new topic, as this is not exactly the same issue as the previous one.
Also, I was able to reproduce the issue using your package, so I’ve logged it in our backlog.