Why don't Christmas songs show up on repeat or repeat rewind?

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I have been really loving the new feature this year of on repeat and repeat rewind so that I can listen to things that I really like. I have found out how ever since the Christmas season, and I'm a big fan of the Christmas songs, the Christmas song I've been listening to all week aren't showing up on either playlist. Instead it's adding songs that I've never listened to before I guess because it seems as if I'm not listening to anything. I just want to know why is that and if anyone else is having that issue?