Stock does not reduce on cloned orders

When an order is cloned, it appears to also copy the original order’s status of having already reduced stock. Here are some simple steps to reproduce the issue:

1. Create a backend order (“Add Order” from WooCommerce admin interface).
2. Add a product that has been configured to manage stock.
3. Change order status to complete and save the order.

Observe: WooCommerce has left a note in the “Order Notes” that confirms that the stock for the item has been reduced.

4. Duplicate the order
5. Change order status to complete and save the order.

Observe: There is no note in the “Order Notes” about reducing stock. Further investigation into the product itself confirms that the stock has not been reduced for this duplicate order.

I have not tested thoroughly, but maybe the meta “_order_stock_reduced” (in wp_postmeta) should be excluded from the duplication. You should also probably exclude “_recorded_sales” and “_recorded_coupon_usage_counts”.

I am grateful for this plugin, and I thank you for looking into this.