GraphQL Admin BulkProductCreation on API v2021-07 doesn't work

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Admin API GraphQL request with the x-request-id: 189c695c-b32c-42c5-99a6-e1e9f7f93278
Is not being processed by server. The mutation status still shows RUNNING.
Tried to wait for 4 hours, still same. Tried to cancel and rerun the mutation, same result. It doesn't give any error. I have no idea how should I debug it.

I have successfully obtained the uploadStagedPath and posted the file to that path as it was instructed on Bulk Import Data post. And run the bulk creation mutation, it says running and only.