That's a good catch on Walmart. Apparently applies to Costco and Sam's Club as well. You could still get 5% if you use Chase Pay.
Fine print:
Does not include purchases made at Walmart® or Target®, discount, or warehouse club stores, except for purchases made with these merchants using Chase Pay or PayPal (a 5% category). If you do not use Chase Pay or PayPal you will still earn unlimited 1% cash back on these purchases.
Discover Card is even more restrictive, though I'm unclear on whether it applies to WM New Market and not just WM Supercenters
Grocery purchases made at convenience stores, gas stations, warehouse clubs, supercenters, discount stores (or at grocery stores associated with supercenters or discount stores) are not eligible. Purchases made using tap-and-pay, mobile or wireless card readers, virtual wallets or similar technology may not be eligible