I have completed all holiday quests so far (except the token one introduced today), but the “quest meter” for Complete All Holiday Quests only shows 2 complete. It looks like it’s only showing the current number of quests visible on the list, so when, for example, the Snowball Fight one expired from the list, it was no longer counted in the quest meter.
No idea if it’s purely a graphical bug or whether the completed quests are no longer being counted, but I figured I’d mention it.