What happened?

I have a workflow that uploads a single xlsx file but it fails with an error of

Error: Failed to CreateArtifact: Received non-retryable error: Failed request: (400) Bad Request: mime_type a valid mime_type is required for this artifact version

What did you expect to happen?

The file would be uploaded

How can we reproduce it?

This workflow reliably reproduces the error https://github.com/mrbusche/upload-artifact-test/actions/runs/22469234111/workflow

Anything else we need to know?

No response

What version of the action are you using?

v7

What are your runner environments?

linux

Are you on GitHub Enterprise Server? If so, what version?

No response