cbor_not_deterministic· reason_code· applies to encoding, schema_validationA hand-written CBOR structure violates RFC 8949 section 4.2 deterministic encoding requirements: indefinite-length items (map 0xbf, array 0x9f, string 0x5f/0x7f), non-minimal length encoding, or unsorted map keys. Receiver MUST reject (top-level schema_violation) instead of normalising. See zh/conformance/scalability-constraints.md section 2 and zh/crypto-media/encryption-and-audit.md section 2.5.3.