Chests can sometimes lose their UI depending on a couple things, only confirmed one ive found was clicking the robux button then denying the purchase, it locks the UI. Its possible that the same happens with money but not confirmed
I have mined a couple sapphires that lead to caves, and when that happens I dont get the sapphire, not sure if this is a bug or intentional.
The NPC for finding a cave quest is broken at the moment, probably due to the new NPC update. you can continuously accept the quest but nothing happens