Missing metadata in bulk export manifest for legal hold

Looking for advice on why custom scripting variables are absent from the bulk export manifest JSON. We run exports via the recording bulk job API for legal discovery. The recordings exist, but the manifest lacks the discovery_id field required for chain of custody. Config below:

export_job:
 start_time: "2023-10-01T00:00:00Z"
 end_time: "2023-10-02T00:00:00Z"
 include_metadata: true

Any ideas?

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