diff --git a/frontend/src/lib/personal-report-chart-caveats.ts b/frontend/src/lib/personal-report-chart-caveats.ts
new file mode 100644
index 00000000..3c2d6abe
--- /dev/null
+++ b/frontend/src/lib/personal-report-chart-caveats.ts
@@ -0,0 +1,45 @@
+import type { TargetChart } from "./rectification-agentic/core/segment-summary.ts";
+
+/**
+ * Section caveats for charts a segment-v1 adoption could not determine (BUG-1139).
+ *
+ * The reader edition prints each divisional chart under its own heading
+ * ("##### D9 九分盘" + chart fence, "#### D9 九分盘 数值位置表" + table). One plain
+ * line goes directly under each such heading; the chart and table stay. A chart
+ * card accepts exactly one paragraph between heading and fence
+ * (`report-chart-grid-rehype.ts::parseCard`), so the line never splits a grid.
+ * Headings are matched on the chart code the engine writes, not on prose.
+ */
+
+export const CHART_CAVEAT_ZH = "提示：出生时间范围内这张盘的上升会变，这一节仅供参考。";
+export const CHART_CAVEAT_EN = "Note: this chart's ascendant changes within the birth-time range; treat this section as reference only.";
+
+const HEADING_RE = /^(#{3,6})\s+(.+?)\s*$/;
+// Engine chart labels: "D9 九分盘", "D9 Navamsa", "Navamsha"; "D10 Dasamsa"; "D1 Rashi".
+const CHART_PATTERNS: Readonly<Record<TargetChart, RegExp>> = {
+  D1: /^D1\b/,
+  D9: /^(?:D9\b|Navamsh?a\b)/,
+  D10: /^(?:D10\b|Dasamsh?a\b)/,
+};
+
+export function annotateUnreliableChartSections(
+  markdown: string,
+  vargas: readonly TargetChart[] | undefined,
+  language: "zh" | "en",
+): string {
+  if (!vargas?.length) return markdown;
+  const caveat = language === "en" ? CHART_CAVEAT_EN : CHART_CAVEAT_ZH;
+  const lines = markdown.split("\n");
+  const out: string[] = [];
+  for (let index = 0; index < lines.length; index += 1) {
+    const line = lines[index]!;
+    out.push(line);
+    const heading = HEADING_RE.exec(line);
+    if (!heading || !vargas.some((varga) => CHART_PATTERNS[varga].test(heading[2]!))) continue;
+    let next = index + 1;
+    while (next < lines.length && !lines[next]!.trim()) next += 1;
+    if (lines[next]?.trim() === caveat) continue;
+    out.push("", caveat);
+  }
+  return out.join("\n");
+}
diff --git a/frontend/src/lib/personal-report-longform-generate.ts b/frontend/src/lib/personal-report-longform-generate.ts
index 519d7105..daa86ae5 100644
--- a/frontend/src/lib/personal-report-longform-generate.ts
+++ b/frontend/src/lib/personal-report-longform-generate.ts
@@ -5,6 +5,7 @@ import type { ReportFactTable } from "./report-fact-table-schema";
 import { persistLongformSnapshot, readLongformSnapshot, validateLongformSnapshot, type LongformSnapshot } from "./personal-report-longform-snapshot";
 import { acceptEnglishEdition, type EnglishOutcome } from "./personal-report-english-edition";
 import { hashLongformMarkdown } from "./personal-report-longform-appendix";
+import { annotateUnreliableChartSections } from "./personal-report-chart-caveats";
 
 import {
   LONGFORM_APPENDIX_TABLE,
@@ -231,9 +232,21 @@ export async function generatePersonalReportLongform(
         fetchImpl: deps.fetchImpl ?? fetch,
         signal: deps.signal,
       });
+      // Segment-v1 adoptions that left D9/D10 undetermined get a line under those
+      // chart sections before the snapshot is hashed (BUG-1139); no-op otherwise.
+      const unreliable = deps.candidateRange?.unreliableVargas;
+      const annotated = unreliable?.length ? {
+        ...generated,
+        markdown: annotateUnreliableChartSections(generated.markdown, unreliable, "zh"),
+        ...(generated.english ? { english: {
+          ...generated.english,
+          markdown: annotateUnreliableChartSections(generated.english.markdown, unreliable, "en"),
+          contentSha256: hashLongformMarkdown(annotateUnreliableChartSections(generated.english.markdown, unreliable, "en")),
+        } } : {}),
+      } : generated;
       snapshot = validateLongformSnapshot({
-        ...generated, ...identity, kind: "longform_calculation_snapshot", version: 2,
-        contentSha256: hashLongformMarkdown(generated.markdown),
+        ...annotated, ...identity, kind: "longform_calculation_snapshot", version: 2,
+        contentSha256: hashLongformMarkdown(annotated.markdown),
       }, identity);
       // Durable complete snapshot precedes the shared Markdown cache and final report.
       deps.signal?.throwIfAborted();
diff --git a/frontend/tests/rectification-chart-tier-caveats-consult.test.ts b/frontend/tests/rectification-chart-tier-caveats-consult.test.ts
index 5e58661f..9bb4a5cf 100644
--- a/frontend/tests/rectification-chart-tier-caveats-consult.test.ts
+++ b/frontend/tests/rectification-chart-tier-caveats-consult.test.ts
@@ -79,7 +79,7 @@ test("chat tool input: segment-v1 carries unreliable_vargas; legacy tool input i
   const legacy = await prepare(legacyAdoption);
   assert.deepEqual(segment.serverChart?.toolInput.unreliable_vargas, ["D9", "D10"]);
   assert.equal("unreliable_vargas" in (legacy.serverChart?.toolInput ?? {}), false);
-  const { unreliable_vargas: _dropped, ...rest } = segment.serverChart!.toolInput;
+  const rest = Object.fromEntries(Object.entries(segment.serverChart!.toolInput).filter(([key]) => key !== "unreliable_vargas"));
   assert.equal(JSON.stringify(rest), JSON.stringify(legacy.serverChart!.toolInput));
   // Byte-identical snapshot of the legacy accepted tool input (red line 1).
   assert.equal(JSON.stringify(legacy.serverChart!.toolInput),
diff --git a/frontend/tests/rectification-chart-tier-caveats-report.test.ts b/frontend/tests/rectification-chart-tier-caveats-report.test.ts
new file mode 100644
index 00000000..fac46926
--- /dev/null
+++ b/frontend/tests/rectification-chart-tier-caveats-report.test.ts
@@ -0,0 +1,119 @@
+import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import test from "node:test";
+import { unified } from "unified";
+import remarkParse from "remark-parse";
+import remarkGfm from "remark-gfm";
+import remarkRehype from "remark-rehype";
+import { reportChartGrid } from "../src/lib/report-chart-grid-rehype.ts";
+import { annotateUnreliableChartSections, CHART_CAVEAT_EN, CHART_CAVEAT_ZH } from "../src/lib/personal-report-chart-caveats.ts";
+
+// Real engine reader output for explicitly fictional births (fixtureProvenance.fictional).
+const densityReader = JSON.parse(readFileSync(new URL("./fixtures/report-density-fictional-reader.json", import.meta.url), "utf8"));
+const readerMain = JSON.parse(readFileSync(new URL("./fixtures/report-reader-main-fictional.json", import.meta.url), "utf8"));
+const readerMainEn = JSON.parse(readFileSync(new URL("./fixtures/report-reader-main-fictional-en.json", import.meta.url), "utf8"));
+
+function chartCards(markdown: string): { cards: number; captions: string[] } {
+  const tree = unified().use(remarkParse).use(remarkGfm).use(remarkRehype).use(reportChartGrid)
+    .runSync(unified().use(remarkParse).use(remarkGfm).parse(markdown)) as { children: unknown[] };
+  let cards = 0;
+  const captions: string[] = [];
+  const text = (node: { type?: string; value?: string; children?: unknown[] }): string =>
+    node.type === "text" ? String(node.value ?? "") : (node.children ?? []).map((child) => text(child as never)).join("");
+  const walk = (node: { properties?: { className?: unknown }; children?: unknown[]; tagName?: string }) => {
+    const classes = node.properties?.className;
+    if (Array.isArray(classes) && classes.includes("personal-report-chart-card")) {
+      cards += 1;
+      const caption = (node.children ?? []).find((child) => (child as { tagName?: string }).tagName === "p");
+      if (caption) captions.push(text(caption as never));
+    }
+    for (const child of node.children ?? []) walk(child as never);
+  };
+  walk(tree as never);
+  return { cards, captions };
+}
+
+test("legacy and empty tiers leave reader Markdown byte-identical", () => {
+  for (const markdown of [densityReader.markdown, readerMain.markdown] as string[]) {
+    assert.equal(annotateUnreliableChartSections(markdown, undefined, "zh"), markdown);
+    assert.equal(annotateUnreliableChartSections(markdown, [], "zh"), markdown);
+  }
+});
+
+test("D9/D10 chart and table sections get one line each; charts and tables stay; idempotent", () => {
+  const raw = readerMain.markdown as string;
+  const annotated = annotateUnreliableChartSections(raw, ["D9", "D10"], "zh");
+  const lines = annotated.split("\n");
+  const flagged = lines.flatMap((line, index) => line === CHART_CAVEAT_ZH ? [lines[index - 2]] : []);
+  assert.deepEqual(flagged, ["##### Navamsha", "##### D9 九分盘", "##### D10 Dasamsa", "#### D9 九分盘 数值位置表", "#### D10 Dasamsa 数值位置表"]);
+  assert.equal(lines.filter((line) => line.startsWith("|")).length, raw.split("\n").filter((line) => line.startsWith("|")).length);
+  assert.equal(annotateUnreliableChartSections(annotated, ["D9", "D10"], "zh"), annotated);
+  // Only the named chart is touched: D1 / D10 / D11 / D12 headings stay bare when only D9 is unreliable.
+  const d9 = annotateUnreliableChartSections(raw, ["D9"], "zh").split("\n");
+  assert.deepEqual(d9.flatMap((line, index) => line === CHART_CAVEAT_ZH ? [d9[index - 2]] : []),
+    ["##### Navamsha", "##### D9 九分盘", "#### D9 九分盘 数值位置表"]);
+});
+
+test("English edition gets the English line under its own chart labels", () => {
+  const annotated = annotateUnreliableChartSections(readerMainEn.markdown, ["D9"], "en");
+  const lines = annotated.split("\n");
+  assert.deepEqual(lines.flatMap((line, index) => line === CHART_CAVEAT_EN ? [lines[index - 2]] : []),
+    ["##### Navamsha", "##### D9 Navamsa", "#### D9 Navamsa Position Table"]);
+  assert.ok(!/[㐀-鿿]/.test(CHART_CAVEAT_EN));
+});
+
+test("chart cards keep their grid: the line becomes the card's caption, never a split", () => {
+  const raw = densityReader.markdown as string;
+  const before = chartCards(raw);
+  const after = chartCards(annotateUnreliableChartSections(raw, ["D9", "D10"], "zh"));
+  assert.ok(before.cards >= 3);
+  assert.equal(after.cards, before.cards);
+  assert.equal(after.captions.filter((caption) => caption === CHART_CAVEAT_ZH).length, 3);
+});
+
+test("longform generation: engine payload unchanged; stored body annotated only for segment-v1 tiers", () => {
+  const script = `
+    import assert from "node:assert/strict";
+    import { mock } from "node:test";
+    import { readFileSync } from "node:fs";
+    mock.module("server-only", { defaultExport: {} });
+    const { generatePersonalReportLongform } = await import("./src/lib/personal-report-longform-generate.ts");
+    const { CHART_CAVEAT_ZH } = await import("./src/lib/personal-report-chart-caveats.ts");
+    const packet = JSON.parse(readFileSync("tests/fixtures/report-density-fictional-engine.json", "utf8"));
+    const golden = JSON.parse(readFileSync("tests/fixtures/report-density-fictional-reader.json", "utf8"));
+    async function run(candidateRange) {
+      const rows = new Map(); let body = "";
+      const admin = { async rpc(name, args) {
+        const table = "personal_report_sections"; const current = rows.get(table);
+        if (name === "ensure_personal_report_section" && !current) rows.set(table, { user_id: args.p_user_id, request_id: args.p_request_id, section_id: args.p_section_id, status: "pending", payload: null });
+        if (name === "complete_personal_report_section" && current?.status === "pending") rows.set(table, { ...current, status: "ready", payload: structuredClone(args.p_payload) });
+        return { data: [], error: null };
+      }, from(table) { return {
+        select() { return this; }, eq() { return this; },
+        async maybeSingle() { return { data: structuredClone(rows.get(table) ?? null), error: null }; },
+        async upsert(row) { rows.set(table, structuredClone(row)); return { error: null }; },
+      }; } };
+      const report = { id: "123e4567-e89b-12d3-a456-426614174000", userId: "123e4567-e89b-12d3-a456-426614174001", requestId: "123e4567-e89b-12d3-a456-426614174002", reportType: "personal_full", presentationMode: "default", depth: "standard", requestedThemes: ["career"], skillName: "jyotish-vedic-astrology", skillVersion: "6.9.14", skillSourceCommit: null, skillSnapshotSha256: "ab".repeat(32) };
+      const result = await generatePersonalReportLongform({ report, admin, candidateRange, displayName: "虚构测试", birthTimeStatus: "accepted",
+        profile: { birth_date: "2000-01-01", active_birth_time: "09:00", birth_time_status: "accepted", latitude: 0, longitude: 0, timezone_offset: 0, ayanamsa: "lahiri" },
+        now: () => new Date("2026-10-01T12:00:00Z"),
+        fetchImpl: async (_url, init) => { body = init.body; return Response.json({ format: "markdown", markdown: golden.markdown, fact_table_packet: packet, reader_dasha_applicability: golden.reader_dasha_applicability }); } });
+      return { body, stored: rows.get("personal_report_longform_appendices").markdown, charts: result.document.charts.length };
+    }
+    const legacy = await run({ startTime: "08:00", endTime: "10:00" });
+    const segment = await run({ startTime: "08:00", endTime: "10:00", unreliableVargas: ["D9", "D10"] });
+    assert.equal(segment.body, legacy.body, "engine payload is identical");
+    assert.equal(legacy.stored, golden.markdown, "legacy stored body is the engine text byte-for-byte");
+    assert.equal(segment.stored.split("\\n").filter(line => line === CHART_CAVEAT_ZH).length, 3);
+    assert.equal(segment.stored.replaceAll("\\n\\n" + CHART_CAVEAT_ZH, ""), golden.markdown);
+    assert.equal(segment.charts, legacy.charts);
+    console.log("OK");
+  `;
+  const result = spawnSync(process.execPath, ["--import", "tsx", "--experimental-test-module-mocks", "--input-type=module", "-e", script], {
+    cwd: fileURLToPath(new URL("..", import.meta.url)), encoding: "utf8",
+  });
+  assert.equal(result.status, 0, result.stderr + result.stdout);
+  assert.match(result.stdout, /OK/);
+});