nav_menu_item_args duplicating children

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I came across [this]) website that has a code snippet to automatically add children to top level pages called with wp\_nav\_menu(). It’s duplicating the children of the first top level page on the remaining top level pages. I’m expecting:

* Top Level Page 1
* Top Level Page 1 Sub 1
* Top Level Page 1 Sub 2
* Top Level Page 2
* Top Level Page **2** Sub 1
* Top Level Page **2** Sub 2

But what I’m getting is:

* Top Level Page 1
* Top Level Page 1 Sub 1
* Top Level Page 1 Sub 2
* Top Level Page 2
* Top Level Page **1** Sub 1
* Top Level Page **1** Sub 2

For the life of me, I can’t figure out why this is happening. The function is being called the correct number of times. The `$item` is correct each time. Yet somehow they all end up with the same children.

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