diff --git a/docs/BUG_HISTORY.md b/docs/BUG_HISTORY.md
index ce37579d..64c01043 100644
--- a/docs/BUG_HISTORY.md
+++ b/docs/BUG_HISTORY.md
@@ -9631,7 +9631,7 @@
 - 根因：`showSelectionCards` 用 `!busy` 整张卸卡；采用请求把对话标成 busy。收尾句用未定义样式的 `.rectification-pending-note` 直接挂在消息列表里，没有助手列让位。采用后若 live offer 锚点被清掉，卡也不再回到原消息。
 - 修复：采用中或已采用时 busy 不再卸卡；用 resultId 锁住首次出示卡片的那条消息。收尾句改到卡片下方，样式与卡片同一条左边线。已采用列按钮保持按下并禁用。不恢复输入框上方状态条。
 - 验证：`frontend/tests/rectification-adopt-cards-stay-20260909.test.ts`、`frontend/tests/rectification-candidate-offer-anchor.test.ts`。`rectification-surface-contract.test.ts` 锁 `verified_idle` 为 `verifiedIdleCopy && !showSelectionCards`（BUG-622）。
-- 防复发：交付卡不得因采用 busy 卸载；`verified_idle` 不得使用无 inset 的裸段落；不得把采用状态写回 composer。改 `verified_idle` JSX 条件时必须同步表面合同正则。
+- 防复发：交付卡不得因采用 busy 卸载；`verified_idle` 不得使用无 inset 的裸段落；不得把采用状态写回 composer。改 `verified_idle` JSX 条件时必须同步表面合同正则。卡锚锁必须走渲染期 `useState`，不得在 render 里读写 ref（`react-hooks/refs`）。
 - 相关记录：BUG-595、BUG-619、BUG-622
 - 复发自：无
 - 修复版本：待发布
@@ -9644,10 +9644,10 @@
 - 影响面：Gitea Independent Staging Quality Gate（`npm test --prefix frontend`）、`class-name-definition-contract.test.ts`、`rectification-surface-contract.test.ts`
 - 用户现象：staging 推送后质量门失败，镜像不发布。产品 UI 无新故障。
 - 触发条件：`ca921c3f`（BUG-618–620）改了 `verified_idle` JSX；`5c476ba7`（BUG-614/615）给 `.personal-report-chart-cell.is-changed` 写了填充。随后 `af70ae77` 再推 staging 仍是同一对失败（runs 2514 / 2516 / 2517）。
-- 根因：产品代码已改，合同测试仍锁旧字面量。`knownUnstyled` 还列着已有 CSS 规则的 `is-changed`；表面合同仍要求 `questionGap === "verified_idle" && (`，实际已是 `verifiedIdleCopy && !showSelectionCards`。
-- 修复：`is-changed` 移出 allowlist；`verified_idle` 断言改跟现行 JSX。不改业务组件。
-- 验证：`frontend/tests/class-name-definition-contract.test.ts`、`frontend/tests/rectification-surface-contract.test.ts`。
-- 防复发：给已在 allowlist 的 class 加规则必须同时删 allowlist 行；改 `verified_idle` 条件必须改表面合同正则，并写原值/新值/原因。
+- 根因：产品代码已改，合同测试仍锁旧字面量。`knownUnstyled` 还列着已有 CSS 规则的 `is-changed`；表面合同仍要求 `questionGap === "verified_idle" && (`，实际已是 `verifiedIdleCopy && !showSelectionCards`。测试转绿后 lint 才跑到：BUG-620 在渲染期读写 `selectionOfferLockRef`，`react-hooks/refs` 4 error。
+- 修复：`is-changed` 移出 allowlist；`verified_idle` 断言改跟现行 JSX。采用卡锁改为 `useState`，在渲染期按 `seededTurns` 同一模式更新（`nextSelectionCardLock` 同值返回同一对象，避免循环 setState）。
+- 验证：`frontend/tests/class-name-definition-contract.test.ts`、`frontend/tests/rectification-surface-contract.test.ts`、`frontend/tests/rectification-adopt-cards-stay-20260909.test.ts`、`frontend/tests/rectification-candidate-offer-anchor.test.ts`；`npm run lint` 0 error。
+- 防复发：给已在 allowlist 的 class 加规则必须同时删 allowlist 行；改 `verified_idle` 条件必须改表面合同正则，并写原值/新值/原因。跨渲染保留的卡锚不得写进 ref 再在 render 里读。
 - 相关记录：BUG-614、BUG-615、BUG-620
 - 复发自：无
 - 修复版本：待发布
diff --git a/frontend/src/components/rectification-agentic-chat.tsx b/frontend/src/components/rectification-agentic-chat.tsx
index 47245119..5038ba43 100644
--- a/frontend/src/components/rectification-agentic-chat.tsx
+++ b/frontend/src/components/rectification-agentic-chat.tsx
@@ -519,7 +519,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
   const stepStartedAtRef = useRef(0);
   const liveToolRef = useRef<string | null>(null);
   const liveBaseLabelRef = useRef("正在处理…");
-  const selectionOfferLockRef = useRef<SelectionCardLock | null>(null);
+  const [selectionOfferLock, setSelectionOfferLock] = useState<SelectionCardLock | null>(null);
   const [compactBoard, setCompactBoard] = useState(false);
   const [boardOpen, setBoardOpen] = useState(false);
   const [boardDiff, setBoardDiff] = useState(() => diffRectificationBoard(null, null));
@@ -1458,14 +1458,19 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
   const persistedOfferKey = [...messages].reverse().find((message) => message.candidateOffer)?.renderKey;
   const liveSelectionCardKey = persistedOfferKey
     ?? (canOfferCards && !candidateResult?.selectedTime ? latestSettledAssistant?.renderKey : undefined);
-  selectionOfferLockRef.current = nextSelectionCardLock(selectionOfferLockRef.current, {
+  // Same render-time store update as seededTurns: the lock must be current
+  // before this paint (BUG-620). A ref write here trips react-hooks/refs.
+  const nextOfferLock = nextSelectionCardLock(selectionOfferLock, {
     resultId: candidateResult?.resultId,
     key: liveSelectionCardKey,
   });
+  if (nextOfferLock !== selectionOfferLock) {
+    setSelectionOfferLock(nextOfferLock);
+  }
   const selectionCardMessageKey = resolveSelectionCardMessageKey({
     persistedOfferKey,
     fallbackKey: latestSettledAssistant?.renderKey,
-    locked: selectionOfferLockRef.current,
+    locked: nextOfferLock,
     resultId: candidateResult?.resultId,
     selectedTime: candidateResult?.selectedTime,
     canOffer: canOfferCards,
diff --git a/frontend/src/lib/rectification-agentic/v9/turn-question.ts b/frontend/src/lib/rectification-agentic/v9/turn-question.ts
index 1c83666e..b4e8802b 100644
--- a/frontend/src/lib/rectification-agentic/v9/turn-question.ts
+++ b/frontend/src/lib/rectification-agentic/v9/turn-question.ts
@@ -203,7 +203,10 @@ export function nextSelectionCardLock(
   input: { resultId: string | null | undefined; key: string | undefined },
 ): SelectionCardLock | null {
   if (!input.resultId) return null;
-  if (input.key) return { resultId: input.resultId, key: input.key };
+  if (input.key) {
+    if (current?.resultId === input.resultId && current.key === input.key) return current;
+    return { resultId: input.resultId, key: input.key };
+  }
   if (current?.resultId === input.resultId) return current;
   return null;
 }
diff --git a/frontend/tests/rectification-adopt-cards-stay-20260909.test.ts b/frontend/tests/rectification-adopt-cards-stay-20260909.test.ts
index e4592ba2..8f174d37 100644
--- a/frontend/tests/rectification-adopt-cards-stay-20260909.test.ts
+++ b/frontend/tests/rectification-adopt-cards-stay-20260909.test.ts
@@ -28,7 +28,12 @@ test("clicking 更像这个 does not unmount the range card for busy", () => {
 test("after adopt the card stays on the locked offering message", () => {
   assert.match(chat, /resolveSelectionCardMessageKey/);
   assert.match(chat, /nextSelectionCardLock/);
-  assert.match(chat, /selectionOfferLockRef/);
+  // 原值：selectionOfferLockRef.current = nextSelectionCardLock(...)
+  // 新值：useState + 渲染期 setSelectionOfferLock（与 seededTurns 同一模式）
+  // 原因：react-hooks/refs 禁止渲染期读写 ref；门禁 lint 0 error（BUG-622）
+  assert.match(chat, /const \[selectionOfferLock, setSelectionOfferLock\] = useState/);
+  assert.match(chat, /if \(nextOfferLock !== selectionOfferLock\) \{\s*setSelectionOfferLock\(nextOfferLock\);/);
+  assert.doesNotMatch(chat, /selectionOfferLockRef/);
   assert.match(messageLoop, /showSelectionCards && candidateResult && message\.renderKey === selectionCardMessageKey/);
 });
 
diff --git a/frontend/tests/rectification-candidate-offer-anchor.test.ts b/frontend/tests/rectification-candidate-offer-anchor.test.ts
index b8b49163..af8ee7c3 100644
--- a/frontend/tests/rectification-candidate-offer-anchor.test.ts
+++ b/frontend/tests/rectification-candidate-offer-anchor.test.ts
@@ -137,6 +137,10 @@ test("hydrated turns drop a stale client offer when GET says this turn is not th
 test("the offer lock keeps the original card host after adopt clears the live key", () => {
   const locked = nextSelectionCardLock(null, { resultId: "result-1", key: "offer" });
   assert.deepEqual(locked, { resultId: "result-1", key: "offer" });
+  assert.equal(
+    nextSelectionCardLock(locked, { resultId: "result-1", key: "offer" }),
+    locked,
+  );
   assert.deepEqual(
     nextSelectionCardLock(locked, { resultId: "result-1", key: undefined }),
     locked,