diff --git a/scripts/reproduce-multi-turn-investigation.mjs b/scripts/reproduce-multi-turn-investigation.mjs
index f69e4d0..5132eb7 100644
--- a/scripts/reproduce-multi-turn-investigation.mjs
+++ b/scripts/reproduce-multi-turn-investigation.mjs
@@ -343,6 +343,16 @@ async function runUpdateOnlyMode() {
     }
   }
 
+  // ── Capture explicit closure metadata from accepted update ─
+  const finalActiveUnknownNodeId =
+    updatedGraph?.activeUnknownNodeId === undefined
+      ? null
+      : updatedGraph.activeUnknownNodeId;
+  console.log(
+    `finalActiveUnknownNodeId: ${JSON.stringify(finalActiveUnknownNodeId)}`,
+  );
+  console.log(`finalSelectedQuestion: ${JSON.stringify(sq)}`);
+
   // ── Capture persistent graph after update ───────────────
   const pNodes = updatedGraph?.nodes ?? [];
   const pEdges = updatedGraph?.edges ?? [];
diff --git a/tests/reproduce-multi-turn-investigation.harness.test.js b/tests/reproduce-multi-turn-investigation.harness.test.js
index 0c05431..aecaa06 100644
--- a/tests/reproduce-multi-turn-investigation.harness.test.js
+++ b/tests/reproduce-multi-turn-investigation.harness.test.js
@@ -156,6 +156,8 @@ function runPreAnchoredSimulationWithFixture(cfg) {
       proposal: proposal ? { addedNodes: proposal.addedNodes ?? [], addedEdges: proposal.addedEdges ?? [], updatedNodes: proposal.updatedNodes ?? [], resolvedUnknownNodeIds: proposal.resolvedUnknownNodeIds ?? [] } : null,
       structuralActionRequired: sar,
       selectedQuestion: sq && typeof sq === "object" ? { question: sq.question, nodeId: sq.nodeId } : null,
+      finalActiveUnknownNodeId: uj.updatedSituationGraph?.activeUnknownNodeId === undefined ? null : uj.updatedSituationGraph.activeUnknownNodeId,
+      finalSelectedQuestion: sq,
       graph: { nodes: uj.updatedSituationGraph?.nodes ?? [], edges: uj.updatedSituationGraph?.edges ?? [] },
     },
     capturedUpdateBody,
@@ -477,6 +479,68 @@ describe("reproduce-multi-turn-investigation harness: one-shot semantics", () =>
     expect(graph.edges[0].relationship).toBe("depends_on");
   });
 
+  it("accepted Update exposes explicit null finalActiveUnknownNodeId", () => {
+    const r = runSimulationWithResponseShape({
+      scenario: "test_ok",
+      maxUpdates: 1,
+      answers: ["good answer"],
+      onResponseUpdate: () => ({
+        success: true,
+        stage: "update_applied",
+        updatedSituationGraph: { nodes: [], edges: [], activeUnknownNodeId: null },
+        selectedQuestion: { question: "q2", nodeId: "n_pending" },
+        updatedProposal: { addedNodes: [], addedEdges: [], updatedNodes: [], resolvedUnknownNodeIds: [] },
+      }),
+    });
+
+    expect(r.captured?.finalActiveUnknownNodeId).toBeNull();
+  });
+
+  it("accepted Update exposes explicit null finalSelectedQuestion", () => {
+    const r = runSimulationWithResponseShape({
+      scenario: "test_ok",
+      maxUpdates: 1,
+      answers: ["good answer"],
+      onResponseUpdate: () => ({
+        success: true,
+        stage: "update_applied",
+        updatedSituationGraph: { nodes: [], edges: [], activeUnknownNodeId: null },
+        selectedQuestion: null,
+        updatedProposal: { addedNodes: [], addedEdges: [], updatedNodes: [], resolvedUnknownNodeIds: [] },
+      }),
+    });
+
+    expect(r.captured?.finalSelectedQuestion).toBeNull();
+  });
+
+  it("accepted Update preserves populated closure metadata unchanged", () => {
+    const r = runSimulationWithResponseShape({
+      scenario: "test_ok",
+      maxUpdates: 1,
+      answers: ["good answer"],
+      onResponseUpdate: () => ({
+        success: true,
+        stage: "update_applied",
+        updatedSituationGraph: {
+          nodes: [],
+          edges: [],
+          activeUnknownNodeId: "n_example",
+        },
+        selectedQuestion: {
+          nodeId: "n_example",
+          question: "What evidence would clarify this example?",
+        },
+        updatedProposal: { addedNodes: [], addedEdges: [], updatedNodes: [], resolvedUnknownNodeIds: [] },
+      }),
+    });
+
+    expect(r.captured?.finalActiveUnknownNodeId).toBe("n_example");
+    expect(r.captured?.finalSelectedQuestion).toEqual({
+      nodeId: "n_example",
+      question: "What evidence would clarify this example?",
+    });
+  });
+
   it("rejected Update still exposes rejectedProposalSnapshot", () => {
     const r = runSimulation({ scenario: "test_ok", maxUpdates: 1, answers: ["answer_reject"] });
     expect(r.startCalls).toBe(1);
@@ -1715,7 +1779,14 @@ function runSimulationWithResponseShape(cfg) {
   const answers = cfg.answers || [];
   const maxUpdates = typeof cfg.maxUpdates === "number" ? cfg.maxUpdates : 2;
   const limit = Math.min(maxUpdates, answers.length);
-  let captured = { answerMeaning: null, proposal: null, selectedQuestion: null, graph: null };
+  let captured = {
+    answerMeaning: null,
+    proposal: null,
+    selectedQuestion: null,
+    finalActiveUnknownNodeId: null,
+    finalSelectedQuestion: null,
+    graph: null,
+  };
 
   for (let i = 0; i < limit; i++) {
     const upResp = api.post("/api/cases/update", { situationGraph: graph, previousQuestion: question, answer: answers[i] });
@@ -1747,6 +1818,10 @@ function runSimulationWithResponseShape(cfg) {
 
     const sq = uj.selectedQuestion ?? null;
     if (sq && typeof sq === "object") captured.selectedQuestion = { question: sq.question, nodeId: sq.nodeId };
+    captured.finalSelectedQuestion = sq;
+
+    captured.finalActiveUnknownNodeId =
+      graph?.activeUnknownNodeId === undefined ? null : graph.activeUnknownNodeId;
 
     captured.graph = { nodes: graph?.nodes ?? [], edges: graph?.edges ?? [] };
   }