This is a known warning and totally safe to ignore. It is an optional field in the Facebook product catalog that Shoelace campaigns do not use. It doesn't serve any particular purpose so it's not a property that we are updating currently. It will not affect your Shoelace campaigns.
What is the “google_product_category” error I am seeing on my product feed

Written by Sanja Smrzlic
Updated over a week ago
Updated over a week ago