If a creature has cover for an entire combat, should it grant extra XP if the higher AC would raise its CR?

@JeremyECrawford If a creature has cover for an entire combat, should it grant extra XP if the higher AC would raise its CR?

— AndruC (@AndruC) September 1, 2017

Cover has no effect on a creature's CR. #DnD https://t.co/gfwbxgrTvq

— Jeremy Crawford (@JeremyECrawford) September 1, 2017