There are kosher bakeries that are open on Shabbos; the g’mara and shulchan aruch discuss this and sets forth halachos concerning the items that are baked on Shabbos. Chazal were not concerned about the items being kosher worthy; just that bread baked on shabbos by a Yid is always forbidden because of k’nas and you need to wait a certain amount of time after shabbos is over before eating the goy’s shabbos baked items.
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