Linking a sub-menu item to another main menu item

I saw this in a wireframe from a team that was designing the menu of a website and saw a weird behaviour where one of the item in the drop down menu linked to the next main element in the menu.

I have not come across this behaviour before and in my opinion this is not required as the second item already has its own space in the menu. Adding the same thing to the sub menu is totally pointless. I want other opinions on this.

In the image you can see that "Item 2" exists in both the sub-menu of the first element and as the main second item in the menu.

Has anyone come across this pattern? To add to this confusion, Item 2 in the first menu is called something else but basically takes the user to the same page as the main item 2 in the menu.

Just confusing