Problem with fetching example_upsert.json

I have a problem with fetching example_upsert.json. How do I upsert it?

  • example_upsert.json: https://dsh.re/725a96
  • When I fetch it using the admin panel or curl https://xxx.pinecone.io/vectors/fetch?ids=item_0, I receive the following:
{
	"vectors": {},
	"namespace": ""
}

But when I upsert the default record using the admin panel → upsert → json editor - https://dsh.re/594a1d - and I fetch it using the admin panel or curl https://xxx.pinecone.io/vectors/fetch?ids=id, I receive the correct data.

Can anyone provide an example of why fetching item_0 isn’t working, but id is?