Hi there.

Pufferfish-related advancement is not working because of an extra ].

Line 15 -> "stellarity.special_item": "pufferfish]"

Can you check it?

Thanks!

Thank you for the bug report. Changes will reflect in 5.0.0-alpha3.

Existing items will remain bugged however, you need to use data modify on an dropped pufferfish to change the special_item to the desired pufferfish.