Fixes a bug affecting controllers on consoles (Switch, PlayStation, and Xbox), but otherwise it's basically the same as 5.2.0
The American Switch does not have a version 5.2.1 because the bug was caught and fixed before 5.2.0 was released on the American Switch
Apple Arcade and Windows don't have a version 5.2.1 because they never had this particular bug
Mythical decorations can now use legendary dyes
Fixed bug that could sometimes prevent Charlotte from giving you a location hint for a quest item.
Shell model letters auto-delete after you've claimed the shell model.
Clothing for Beatrice's quest will now be available when her quest is active
The fix will not help players who already had their quest goals locked in prior to version 5.2.0. If this is your situation, please wait until you have version 5.2.0 or higher installed, then email email@example.com for help.
The main menu "festival calendar" has been adjusted so that the end date of every festival is displayed as happening on the last full day of the festival, instead of the following day (festivals technically end at 5am local time, but midnight to 5am isn't "another day" in most people's minds!)