Found a work-around. Under Woocommerce/Settings/Shipping/USPS I checked “First Class Package Service” in addition to my usual checked box of “First Class Mail Parcel”. The rates for this “First Class Package Service” are almost identical. Problem solved for now.
My first class rates are still not showing. Any estimate as to when this will be fixed?
I’m having the same issue. Didn’t happen until I upgraded the woo templates.