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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Reading the link you posted: "Browser compatibility: Node 21".
It is not a bug with the kata, you used API which is not available on Codewars.