I can see the goblin thing. They are naturally sneaky little things, because goblins have:
Nimble Escape. The goblin can take the Disengage or Hide action as a bonus action on each of its turns.
Really though the heart of the problem is the whole cavern and the statues themselves as have been covered in many ways by everyone. Allow for a disabling mechanic that makes sense, other ways of obtaining the circlet. Such as stopping the shadow druids from their take over should grant one. Rescuing Halsim, etc. Maybe hide one in the chamber you get locked in with netti and give us a way of stealing it without aggroing everyone.
In response to a question someone asked earlier, it seems to me this patch the statues have a larger range than before. You can block line of sight, so going invisible, casting darkness, etc will stop the statues. You can even leap frog a double stack of crates as a wall to hide behind your way past the statues. All creative but ultimately just poorly designed defense mechanism. I mean its really effective which is why we are complaining, but in a game play perspective and story wise it seems like just a mechanic designed to torture players for saving the halfling druid.
