Currently, if you Copy-Paste a Button in-place, the duplicate Button will be placed inside of the duplicated Button.
As a result, this wipes the content of the Button (in the default case, the text displayed on the Button).

Undoing this Copy-Paste operation will successfully remove the duplicated button. However, the content of the Button will be permanently lost and unable to be brought back in the Undo/Redo Stack.

I imagine this likely happens with other Elements similar to the button that can be populated with content inline.

See attached video.

Repro Steps:

1) Open the Z3L Sample from the InternalProjects repo.
2) Select any of the Main Menu Buttons on the left of the screen, and press Ctrl+C, then Ctrl+V.
This will place a copy of the selected Button within itself.
3) Press Ctrl+Z multiple times to completely Undo the actions taken in Step 2).
Observe how the original text that was originally set on the original Button never returns.

Expected Result: A Copy-Paste operation never results in permanent Property value loss unrecoverable via the Undo Stack.