The chest in Curiosity contains a Lightning Rod instead, for some reason?
Also, it's possible to explore the "glitched levels" in Curiosity a bit further. They're actually just the rest of the level, but they seem glitched because you're outside where you're supposed to be, and invisible walls that would normally be moved in gameplay are still set up. With Winged Boots +3, you can climb on top of the invisible walls and keep going right to the next transition of the level, and if you continue further to the right, you'll get here:
I haven't found anything past there, though, and it looks like this is all unintentional.