diff --git a/src/__tests__/siteSetting.spec.ts b/src/__tests__/siteSetting.spec.ts
index 6f90209..4fec090 100644
--- a/src/__tests__/siteSetting.spec.ts
+++ b/src/__tests__/siteSetting.spec.ts
@@ -297,3 +297,33 @@ describe("SiteSetting 编辑模式（site/setting/:id，docs/20 F1 7 Tab）", ()
         expect(config.home_layout).toBeTruthy(); // 其他 Tab 键不受影响
     });
 });
+
+describe("SiteSetting 假脏防护（docs/20 返工 #2）", () => {
+    it("冷加载不标脏：7 个 Tab 标题均无 ●（种值触发的 watcher 落在 seeding 窗口内）", async () => {
+        routeMock.params = { id: "1" };
+        const el = mountPage();
+        await flush();
+
+        const labels = Array.from(el.querySelectorAll(".ivu-tabs-tab")).map(t => t.textContent!.trim());
+        expect(labels.length).toBe(7);
+        labels.forEach(t => expect(t.includes("●")).toBe(false));
+    });
+
+    it("真实编辑才标脏：改站点名称 → 基本信息 ●；保存成功后 ● 消失", async () => {
+        routeMock.params = { id: "1" };
+        const el = mountPage();
+        await flush();
+        const labels = () => Array.from(el.querySelectorAll(".ivu-tabs-tab")).map(t => t.textContent!.trim());
+
+        const nameInput = el.querySelector<HTMLInputElement>('input[placeholder="如 XX学校门户网站"]')!;
+        setInputValue(nameInput, "改名后的门户");
+        await flush();
+        expect(labels().find(t => t.includes("基本信息"))!.includes("●")).toBe(true);
+
+        const saveBtn = [...el.querySelectorAll("button")].find(b => b.textContent?.includes("保存基本信息"))!;
+        saveBtn.dispatchEvent(new MouseEvent("click", { bubbles: true }));
+        await flush();
+        expect(mocks.siteSave).toHaveBeenCalledTimes(1);
+        expect(labels().find(t => t.includes("基本信息"))!.includes("●")).toBe(false);
+    });
+});
diff --git a/src/views/cms/SiteSetting.vue b/src/views/cms/SiteSetting.vue
index 5a10bea..227236f 100644
--- a/src/views/cms/SiteSetting.vue
+++ b/src/views/cms/SiteSetting.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, onMounted, reactive, ref, watch } from "vue";
+import { computed, nextTick, onMounted, reactive, ref, watch } from "vue";
 import { useRoute, useRouter } from "vue-router";
 import { Message } from "view-ui-plus";
 import { siteApi, themeApi } from "@/api/module/cms";
@@ -159,7 +159,7 @@ async function loadThemes() {
 }
 
 /** 载入站点 → 各 Tab 模型按 lastSavedConfigJson 种子（seeding 挂起 dirty 标记） */
-function initFromRow(id: number) {
+async function initFromRow(id: number) {
     const r = sites.value.find(s => s.id === id);
     if (!r) {
         loadError.value = "站点不存在或无权管理该站点";
@@ -187,6 +187,10 @@ function initFromRow(id: number) {
     seoModel.value = lastSavedConfigJson.value;
     customCss.value = readCustomCss(lastSavedConfigJson.value);
     Object.keys(dirty).forEach(k => (dirty[k] = false));
+    // docs/20 返工 #2：seeding 是同步布尔位，而 Vue watcher 异步 flush——种值触发的 watcher 回调
+    // 落在下一个 flush 周期（此时同步代码早已把 seeding 置回 false），必须等它们在挂起窗口内
+    // 跑完再放行，否则冷加载即假脏
+    await nextTick();
     seeding = false;
 }
 
@@ -268,7 +272,7 @@ async function persistTab(tab: TabKey, patch: Record<string, unknown> | null) {
             }
         }
         dirty[tab] = false;
-        // 保存回灌：本 Tab 模型与服务端事实源对齐（seeding 挂起 dirty 重标）
+        // 保存回灌：本 Tab 模型与服务端事实源对齐（seeding 窗口须覆盖异步 flush 的 watcher，返工 #2 同 initFromRow）
         seeding = true;
         if (tab === "layout") {
             layoutModel.value = lastSavedConfigJson.value;
@@ -276,6 +280,7 @@ async function persistTab(tab: TabKey, patch: Record<string, unknown> | null) {
         } else if (tab === "css") {
             customCss.value = readCustomCss(lastSavedConfigJson.value);
         }
+        await nextTick();
         seeding = false;
     } finally {
         saving[tab] = false;
diff --git a/src/views/cms/components/SiteConfigForm.vue b/src/views/cms/components/SiteConfigForm.vue
index 88e9ba9..e91318f 100644
--- a/src/views/cms/components/SiteConfigForm.vue
+++ b/src/views/cms/components/SiteConfigForm.vue
@@ -57,11 +57,18 @@ watch(
 );
 
 function emitUp() {
-    lastEmitted = serializeSiteConfig({
+    const next = serializeSiteConfig({
         fields: { ...formModel.fields },
         preserved,
     });
-    emit("update:modelValue", lastEmitted);
+    // docs/20 返工 #2 no-op 守卫：本次序列化结果与当前传入 modelValue 经同一解析/序列化管线归一后
+    // 语义等价则不回写——挂载规范化、编辑后撤销往返不再触发父级假脏（保存路径读 ownFields() 取
+    // 实时表单模型，此处跳发不会造成取值滞后）。
+    if (next === serializeSiteConfig(parseSiteConfig(props.modelValue))) {
+        return;
+    }
+    lastEmitted = next;
+    emit("update:modelValue", next);
 }
 
 /** 保存前校验：内置字段 Form 规则；通过返回 true */
diff --git a/src/views/cms/homeLayout/HomeLayoutEditor.vue b/src/views/cms/homeLayout/HomeLayoutEditor.vue
index 11f6708..eed1ed2 100644
--- a/src/views/cms/homeLayout/HomeLayoutEditor.vue
+++ b/src/views/cms/homeLayout/HomeLayoutEditor.vue
@@ -74,8 +74,15 @@ function emitUp() {
         : current
             ? { version: HOME_LAYOUT_VERSION, blocks: [] }
             : null;
-    lastEmitted = serializeHomeLayout(props.modelValue, layout);
-    emit("update:modelValue", lastEmitted);
+    const next = serializeHomeLayout(props.modelValue, layout);
+    // docs/20 返工 #2 no-op 守卫：与当前 modelValue 严格相等则不回写（等价操作往返后父级不重标脏）。
+    // 此处必须用严格相等而非语义比较：保存路径 layoutPatchOf 读的是父级 layoutModel，跳发一个
+    // 「语义等价但字符串不同」的值会让父级停留在旧序列化形态，保存时落库旧状态。
+    if (next === props.modelValue) {
+        return;
+    }
+    lastEmitted = next;
+    emit("update:modelValue", next);
     schedulePreview();
 }