Hi,
On a new Install of ATUM 1.6.5 with Woo 3.8.1, I'm getting some really weird reporting for products and orders--namely, it's not reporting on any of the products I have marked controlled (all of them).
On investigation, I found that Helpers::is_using_new_wc_tables() is returning false. Which makes sense, because class_exists('WC_Product_Data_Store_Custom_Table'); returns false.
Which makes sense, because that class isn't defined in your code nor is it part of WooCommerce's core.
What am I missing?