See what we wrote at https://www.theyeshivaworld.com/coffeeroom/topic/rosh-hashanah-contradictory. Yom Kippur we have a mitzva of eating Erev Yom Kippur to make up for the simcha of Kabolas Hatorah. When Yom Kippur falls on Shabbos, our fasting is an oneg shabbos as it provides a simcha of forgiveness.
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