There was an error on nan_product_pack V6.X where after using it in a sale order, you duplicate that sale order, all the lines from pack used to stay on origin sale order.
nan_product_pack has been included in several repositories from different integrators, so depending the repository you used to migrate, bug could still be there. On the other side, it's very easy to fix. New sale_order_id not asigned on copied sale order lines but origin sale_order_id.
Just to point it:
There was an error on nan_product_pack V6.X where after using it in a sale order, you duplicate that sale order, all the lines from pack used to stay on origin sale order.
nan_product_pack has been included in several repositories from different integrators, so depending the repository you used to migrate, bug could still be there. On the other side, it's very easy to fix. New sale_order_id not asigned on copied sale order lines but origin sale_order_id.
My 2 cents