Duplicating walls results in unexpected behavior.

Duplicated walls appear to share the same reference or same points. Editing them can result in strange behavior. One wall will not show up properly or will snap to the other's location and vice versa.

Repro steps:
Create wall
Move wall to new location and adjust points.
Duplicate wall.
Move duplicate and adjust points.

Expected result: The duplicated wall behaves as a normal new wall would.
Actual result: The walls appear to be treated as the same entity.