white keyframes in the Animate CC timeline

Does anyone know what is the purpose of adding 'color effect' changes by selecting the keyframe(and not the symbol on the stage) and adding a color effect? The normally black keyframe turns 'white' ?

Normally you select the symbol and then select a property however now you can select the keyframe of the symbol and then change the property of 'color'. What results is a little confusing as well.