This is, in particular, about the chests from the final bosses in Drizzlewood. Some of those events spawn a ton of tiny chests, and half of them disappeared on me before the map closed. I saw from a post from last year that they're supposed to be on some kind of 5 minute timer (though it honestly felt much shorter than that). Is there a reason for that? I mean, the map is going to close regardless, why take it away early? I was cleaning my bag space on the spot when this happened, and missed out on quite a bit of chests.