Sanity Library Reference Docs
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    InitialFieldIssue: { index: number; name: string; type: FieldKind } & (
        | { duplicateIndexes: number[]; reason: "duplicate" }
        | { reason: "undeclared" }
        | { expectedTypes: FieldKind[]; reason: "wrong-kind" }
        | {
            reason: "not-input";
            source:
                | "working-memory"
                | Exclude<NonNullable<FieldEntry["initialValue"]>["type"], "input">;
        }
        | { declaredType: FieldKind; reason: "invalid-scope"; stage: string } & (
            { scope: "stage" }
            | { activity: string; scope: "activity" }
        )
    )

    Why one caller-supplied initial-field row cannot be consumed.