We’ve recently encountered a discrepancy in the subjects returned by the Crossref REST API, specifically when comparing results from the Public and Polite API responses.
https://api.crossref.org/works/10.36347/sjams.2022.v10i11.034 => "subject": [ "Education", "Cultural Studies" ]
https://api.crossref.org/works/10.36347/sjams.2022.v10i11.034?mailto=GroovyBib@example.org => "subject": [ "Industrial and Manufacturing Engineering", "Metals and Alloys", "Strategy and Management", "Mechanical Engineering" ]
Here are a few more DOIs with similar inconsistencies:
Is this a known issue, or can anyone provide insight into this discrepancy?