Update Broke "Clone Product"

Woo 2.3.9 broke “clone product” in my installation.
It copies a product page but fails to bring over the content – and stymies the back end in the process, feels like big load on server, taking the site down. Ended up not working.

Had to replace the functionality by installing “duplicate posts: plugin, which works fine.

https://wordpress.org/plugins/woocommerce/