I think I remember Yuyu saying in the discord that the golden chest is simply a bug. I'm not sure about the pink bar though.A few issues and a suggestion.
First, the transition between the cavern/lava layer while in the Spirit biome has a weird pink line on it.
Second, in the Reach, there's a locked gold dungeon chest that contains nothing when i open it. Is this intended to be an upcoming Post-Skeletron item or a biome chest placeholder?
Also, Music Box, Banner, and Tally Counter support would be great.
I definitely agree with your bottom statement, music boxes would be great