patch_path_reducer_managed· reason_code· applies to event_envelopeAn `ak.schema.patch.v1` patch path addresses a field the generic update surface does not own. The normative per-object path set is registry/reducer-managed-path-registry.json (universal minimum set plus per-object-kind additions, minus the named View `state` exemption); the description here is not the criterion and MUST NOT be read as one. The forbidden path and every dotted descendant of it are rejected together. See zh/models/event-and-patch.md §4.2.5.