I’m having the exact same problem as Austin. The system of record is showing WooCommerce. When the viewing quantities of products in Woocommerce, the text field is greyed out with the text Fetch stock with Square. When I check on Square’s side, current stock is also greyed out. Thankfully most of the quantities are correct, but for items that are incorrect with low stock, I’ve had to disable them.
I’ve tried disconnecting WooCommerce from Square and then reactivating it again, and got the same result.
Hopefully a fix can be found quickly…