'WooCommerce: duplicate category child slug, different parent

We have a WooCommerce site with 2 parent categories: New Furniture and Used Furniture.

They both have a child category called Chairs.

These are the URL's we get:
/new-furniture/chairs

/used-furniture/chairs-1

I can't change the slug of chairs-1 to chairs, why is this the case? And how would i fix this?

phpwordpresswoocommerce


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