Flavor changed for the worse

Corn Pops were my favorite cereal growing up. I picked up a box recently and noticed immediately that it didn’t taste nearly as good as it once did. It has almost no flavor now but has an unpleasant aftertaste that lasts awhile. They stopped using foil lined packaging but I don’t know if that’s the cause or if they changed the recipe. I won’t be buying it again unless they change it back.