The video shows the bug, but I couldn’t reproduce the other bug I had happen once when undoing where some of the nodes had their names changed back to just “Node” instead of their newly given names at the beginning of the video.
Edit: I overly trimmed the video, but at the end after undoing the part named 8 isn’t re-added to the workspace.
I have all current beta features, except for Texture Generator enabled as of writing.
last_instance_on_undo_doesnt_get_readded.rbxl (68.2 KB)
There’s 2 node folders in workspace, one with the numeric names and one without. Alongside the command bar script being a script named COMMAND BAR SCRIPT
Runtime Undo Behavior is set to the default of Aggregate.
Expected behavior
I would expect the last instance despite it being the only one that gets the “Attempt to set INSTANCE_NAME as its own parent” to be re-added to the workspace when I hit undo.

