1. Enter Eden editor and place a unit.
2. Copy the unit.
3. Place a unit and delete it.
4. Paste the unit.
5. Undo -> Redo.
6. The units group is now stuck at [0,0,0].

For step 3 it doesn't have to be a unit specifically, anything seems to work as long as its a delete entry in history.
This only seems to occur for pasted units, if you replace step 4 with placing unit instead their group is fine.

You can still move the group which causes the unit to also be moved. However the group snaps back to [0,0,0] right away after the move.