If you use the B&H sales shelves and wall (for selling items that hang on walls), yes you will lose the "restock master objects" ability. I was forgetting the GtW retail shelves. I'll have to try them out in my next B&H setting. (Right now my sim has closed her business and moved to Evergreen Harbor [Eco Lifestyle], to be with her fiancee, where she's gardening, writing books, and skilling up for Rock Climbing.)
As for the Rice Cooker, have you already upgraded it all the way? Wondering if that could be why its food still has a timer on it for freshness. My sim doesn't currently use a rice cooker, as her kitchen is too small for it. I'll make some adjustments and give that a try with a rice cooker, to see if that has something to do with it. (I make sure all my Sims have the Master Chef abilities/perks.)
The restocking feature depends on the type of lot you use to sell items. The get to work retail shelves work fine but they function the same as the businesses and hobbies shelves, no restock items as long as you use them in a small business
