End dungeon chests bugged???

[Firehair]

why i the chests in the end of dungeon cant be opened?? i got the key already

[Seemslegit]

I noticed that when you do some daily missions , these chests are not even locked . In fact they reward you for running the daily on top of the daily mission reward at least on lower levels .

[Shirou]

Some chests will be able to be opened only during story quest, such as plague insect dungeon.