I’m not sure if this has previously been mentioned, but there is an apparent bug with Jumping Puzzle chests.
Last night I did Chaos Crystal Cavern (for the first time in ages), and the chest was already open, this has happened on 2 previous occasions with 2 different puzzles, all since the latest update.
I am not alone in this, I normally do a whole batch of Puzzles with 3 or 4 fellow Guildies, and they have reported a similar issue.
I believe in a long, prolonged, derangement of the senses in order to obtain the unknown.