Adding multiple custom catalogs?

The operation couldn’t be completed. (com.apple.ShazamKit error 300.)

I get this error when I try to add multiple shazamcatalogs on a single SHCustomCatalog. The fact that the operation is called add(from:) and not 'load' lets me suggest that it's meant to use that way. Am I wrong?

And yes, both work work if I just add one at a time.

let catalog = SHCustomCatalog()
do {
  try catalog.add(from: url1)
  try catalog.add(from: url2)
  {...}
} catch {...}

.

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Also, fun fact: I was working on a ShazamKit myself before dubDub and it's a really fascinating topic and so awesome to see how well it works, great job! 👏