If you haven't played before today this update doesn't effect you.
Curators and testers who accessed the unreleased beta and made saves in versions before today's update will experience issues with chests and spawners and probably error messages when loading any saves created before this update.
The save system backend was modified so that I can add new objects such as chests and spawners and items to the world and have them be added to existing saves when someone loads it up.
If you have a save from before today's update you may want to start a new game.
I don't anticipate people needing to start new saves after this update since anything new added by future updates should now be added to existing saves.
Thanks for reading!