Will the Jester Festival XP buff stack with Jubilee XP buff?
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Edited for more clarification:
The buff will remain just as if it were any other source of xp. They do not count down while not logged into that character. However, the event buffs will never stack. Most will refresh the older buff. As an example, I had a character with the witchmother's double xp status during *this* event, and I used a pie to refresh its duration to 2 hours. They may overwrite (and I don't know the rhyme or reason for this), but effectively there is no way to "save" the buff and utilize both.
Never has before, and super unlikely it will this time around unless there's a bug/exploit floating around.
Event XP buffs override each other, and scroll/consumable XP buffs do the same; though they are two separate sources of bonus XP, they behave identically. Event/event buffs cannot stack, and consumable/consumable buffs cannot stack.