Can't uncheck "Cast Goodberry" in Travel Settings

If the character cannot cast the spell, you cannot uncheck the setting. Which makes no sense - it should be off by default if you can't cast the spell. Check: When you can freely cast spells (not during overland travel), make sure you can cast the spell. If not, fix whatever keeps you from casting it.

As a work around, you could sell the food to a vendor or drop it on the ground, then loot the bag without taking anything, which will let the Scavengers sell it when they clean the area.