I am attempting to stack polygon features by creating multiple duplicates at once. I thought I could achieve this by using the Duplicate Vertical or Array editing tools and setting any of the offsets to zero feet, but when I hit Duplicate/Array, no additional features get created. It only works if the offset is greater than zero, but I need my features to stack exactly on top of each other with no vertical or lateral offset. Is this intentional or a bug? If it is intentional, meaning it's not possible to set the offset to 0 feet, then there should be some warning or the execute button should be grayed out.