Seems what confuses people is that instead of each chest having its own loot table, the chests in the new dungeons all share the loot table... meaning you can end up with crafting mats from the boss chests and gear from the chests outside...
This helps prevent in-progress spamming from people that are only interested in a chest at the end...

I expect next stage of the crystal tower to adopt this model too for the same reason...