Yo dude, you need to beat Plantera, as the tooltip says, ‘Cursed by a powerful jungle creature’, which means you gotta beat Plantera first. Sorry man, dems da rules, and it’s not a bug.The Hollowed key does not open the hollowed chest and in the attached picture you can see that the key does not have the normal description either. The key is from the first 1.4 update.