Discoloured white chocolate chips
This is a very easy fix.  If you simply coat the chips in flour before adding them to the mix, and then gently fold them in, you should get no discoloration, and the chips will stay suspended and not settle to the bottom.  For gluten-free recipes, coating with 10x powdered sugar will also work, as it contains cornstarch.  The trick is coating the sugar-containing items with starch of some kind.