diff --git a/kernel/package-lock.json b/kernel/package-lock.json
index da83f9717..42edfa9cb 100644
--- a/kernel/package-lock.json
+++ b/kernel/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "acp-kernel",
-  "version": "0.0.195",
+  "version": "0.0.196",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "acp-kernel",
-      "version": "0.0.195",
+      "version": "0.0.196",
       "license": "MIT",
       "devDependencies": {
         "@types/node": "^22.0.0",
diff --git a/kernel/package.json b/kernel/package.json
index c130a693b..f03fc7ade 100644
--- a/kernel/package.json
+++ b/kernel/package.json
@@ -1,6 +1,6 @@
 {
   "name": "acp-kernel",
-  "version": "0.0.195",
+  "version": "0.0.196",
   "description": "Framework-agnostic context-compression engine (model-driven, 3-tier LSM). Pure core: no host dependency.",
   "license": "MIT",
   "author": "ranxianglei",
diff --git a/kernel/src/parse-compress-input.ts b/kernel/src/parse-compress-input.ts
index 7ebc49c20..cf3212f27 100644
--- a/kernel/src/parse-compress-input.ts
+++ b/kernel/src/parse-compress-input.ts
@@ -496,8 +496,12 @@ const SINGLE_REF_IN_LINE = /^([mb]\d{1,7})\b/i;
 // An unrecognized divider between two refs (punctuation run + a ref right
 // after) — the pair regex missed a separator variant. Folding as a single
 // ref would silently compress ONE message of a many-message range.
+// #6071: the run may mix punctuation with Han-script letters — CJK range
+// words (到/至) are \p{L}, so the original class let "m07890到m07950" through
+// as a single-ref header and narrowed a multi-message fold to one message,
+// exactly what this guard exists to prevent.
 const UNRECOGNIZED_REF_SEP_RE =
-  /^\s*[^\p{L}\p{N}\s]{1,3}\s*[mb]\d{1,7}\b/iu;
+  /^\s*(?:[^\p{L}\p{N}\s]|\p{Script=Han}){1,3}\s*[mb]\d{1,7}\b/iu;
 
 function normalizeLineRef(raw: string): string {
   const lower = raw.toLowerCase();
diff --git a/kernel/tests/parse-compress-input.test.ts b/kernel/tests/parse-compress-input.test.ts
index 2e548cc83..53a846164 100644
--- a/kernel/tests/parse-compress-input.test.ts
+++ b/kernel/tests/parse-compress-input.test.ts
@@ -1387,6 +1387,39 @@ test("parseCompressArgs refuses to narrow a ref pair with an unrecognized separa
   assert.equal(single.ranges[0]?.endRef, "m00150");
 });
 
+// #6071 field (session-9dd7b2f0): CJK models join refs with Han range words
+// like 到/至. Those are \p{L}, so the original guard class never matched them
+// — "m07890到m07950 t" parsed as a SINGLE ref m07890 with topic "到m07950 t"
+// and silently folded one message of a many-message range instead of
+// rejecting loudly. Both directions pinned: Han-word + second ref rejects;
+// a Han topic NOT followed by a ref still parses as a single ref.
+test("parseCompressArgs refuses to narrow a ref pair joined by a Han-script word", () => {
+  const { ranges, diagnostics } = parseCompressArgs({
+    content: "m07890到m07950 t\nsummary.",
+  });
+  assert.equal(ranges.length, 0);
+  assert.equal(diagnostics.kind, "no-valid-ranges");
+  assert.match(diagnostics.invalidReasons?.[0] ?? "", /separator not recognized/);
+  const zhi = parseCompressArgs({ content: "m00150至m00168 t\nsummary." });
+  assert.equal(zhi.diagnostics.kind, "no-valid-ranges");
+  // A mixed punct+Han run joins refs just as loudly.
+  const mixed = parseCompressArgs({ content: "m00150，到m00168 t\nsummary." });
+  assert.equal(mixed.diagnostics.kind, "no-valid-ranges");
+});
+
+test("single-ref headers with Han topics still parse when no second ref follows", () => {
+  // 到期 is an ordinary topic word — nothing ref-shaped behind it → single ref.
+  const due = parseCompressArgs({ content: "m00150 到期的任务\nsummary." });
+  assert.equal(due.ranges[0]?.startRef, "m00150");
+  assert.equal(due.ranges[0]?.endRef, "m00150");
+  // The guard extension is Han-only: Latin-letter topics were always safe and stay safe.
+  // (Topic must not start with the literal "to" separator — "tom00220" would join
+  // into a pair via the pre-existing word form.)
+  const latin = parseCompressArgs({ content: "m00150 xyz00220 notes\nsummary." });
+  assert.equal(latin.ranges[0]?.startRef, "m00150");
+  assert.equal(latin.ranges[0]?.endRef, "m00150");
+});
+
 // ---------------------------------------------------------------------------
 // stringified single entry (#5949 field)
 // ---------------------------------------------------------------------------
diff --git a/package-lock.json b/package-lock.json
index b333eb55f..e2ff6fb48 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -50,7 +50,7 @@
     },
     "kernel": {
       "name": "acp-kernel",
-      "version": "0.0.195",
+      "version": "0.0.196",
       "dev": true,
       "license": "MIT",
       "devDependencies": {
diff --git a/src/compress-tool.ts b/src/compress-tool.ts
index ccfe2d0de..d662a09c4 100644
--- a/src/compress-tool.ts
+++ b/src/compress-tool.ts
@@ -599,6 +599,25 @@ function decodeDoubleEscapedContent(input: unknown): Record<string, unknown> | u
     return { ...input, content: decoded };
 }
 
+// #6071: rejected line-form entries were logged without their payload, so an
+// unrecognized separator seen in the field had to be guessed from the model's
+// next retry. A bounded preview of the offending content (a bare string or
+// the string entries of a content array) pins the exact shape on first sight.
+// Server log only — never echoed into the model-facing receipt (#1454).
+function rejectedContentPreview(normalized: unknown): string | undefined {
+    const pieces: string[] = [];
+    if (typeof normalized === "string") pieces.push(normalized);
+    else if (isPlainObject(normalized)) {
+        const content = normalized["content"];
+        if (typeof content === "string") pieces.push(content);
+        else if (Array.isArray(content)) {
+            for (const item of content) if (typeof item === "string") pieces.push(item);
+        }
+    }
+    if (pieces.length === 0) return undefined;
+    return JSON.stringify(pieces.map((p) => p.slice(0, 150)).join(" // ").slice(0, 300));
+}
+
 // #5161: options.quiet suppresses every diagnostic log of this parse. The
 // internal #2749 scan (visibleSummaryStubs) re-parses ALL visible past compress
 // calls on every fold, and in external-summary mode a summary-less entry is
@@ -635,7 +654,8 @@ export function parseCompressInput(input: unknown, callId?: string, options: { q
         note(`[acp-compress-input] flat-summary salvage: recovered ${parsed.ranges.length} range(s); summary text arrived in content alongside top-level refs`);
     }
     if (!parsed.diagnostics.ok && parsed.diagnostics.kind !== "ok") {
-        note(`[acp-compress-input] rejected: kind=${parsed.diagnostics.kind} invalidItems=${parsed.diagnostics.invalidItems}${parsed.diagnostics.keys ? ` keys=[${parsed.diagnostics.keys.join(",")}]` : ""}${parsed.diagnostics.length !== undefined ? ` len=${parsed.diagnostics.length}` : ""}${parsed.diagnostics.invalidReasons && parsed.diagnostics.invalidReasons.length > 0 ? ` reasons=[${parsed.diagnostics.invalidReasons.join(" | ")}]` : ""}`);
+        const preview = rejectedContentPreview(normalized);
+        note(`[acp-compress-input] rejected: kind=${parsed.diagnostics.kind} invalidItems=${parsed.diagnostics.invalidItems}${parsed.diagnostics.keys ? ` keys=[${parsed.diagnostics.keys.join(",")}]` : ""}${parsed.diagnostics.length !== undefined ? ` len=${parsed.diagnostics.length}` : ""}${preview !== undefined ? ` preview=${preview}` : ""}${parsed.diagnostics.invalidReasons && parsed.diagnostics.invalidReasons.length > 0 ? ` reasons=[${parsed.diagnostics.invalidReasons.join(" | ")}]` : ""}`);
     } else if (parsed.diagnostics.invalidItems > 0 || parsed.diagnostics.kind === "truncated") {
         // #1494: partial drop — at least one range survived, so the old
         // condition above never fired and the rejection was invisible on both
diff --git a/tests/issue6071-compress-reject-preview.test.ts b/tests/issue6071-compress-reject-preview.test.ts
new file mode 100644
index 000000000..2ad5d06a3
--- /dev/null
+++ b/tests/issue6071-compress-reject-preview.test.ts
@@ -0,0 +1,64 @@
+// #6071 field (session-9dd7b2f0): a compress call rejected with
+// kind=no-valid-ranges ("refs separator not recognized") was logged WITHOUT
+// the offending payload — the server line carried only kind/keys/reasons, so
+// the exact separator the model used had to be guessed from its next retry.
+// Fix: the rejected warn carries a bounded preview of the offending content
+// (a bare string or the string entries of a content array). Server log only;
+// never echoed into the model-facing receipt (#1454), and quiet (#5161) still
+// suppresses it via the shared note() helper.
+//
+// Gate both directions (#3617): a rejected LINE entry logs preview=; a
+// rejected OBJECT entry (nothing string-shaped to preview) does not.
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { parseCompressInput } from "../src/compress-tool.ts";
+import { setLogCapture } from "../src/logger.ts";
+
+/** Run fn under the logger's programmatic capture seam (same pattern as
+ *  tests/issue5161-compress-scan-log-noise.test.ts) and return its lines. */
+function withLogCapture<T>(fn: () => T): { result: T; lines: string[] } {
+    const lines: string[] = [];
+    setLogCapture((_level, msg) => { lines.push(msg); });
+    try {
+        return { result: fn(), lines };
+    } finally {
+        setLogCapture(null);
+    }
+}
+
+const ACP_INPUT_LINES = (lines: string[]): string[] => lines.filter((l) => l.includes("[acp-compress-input]"));
+
+test("#6071 rejected line entry logs a bounded preview of the offending content", () => {
+    // The pinned unrecognized-separator shape (=> must stay rejected, kernel
+    // guard test) — independent of which separators the kernel accepts.
+    const header = "m00150 => m00168 topic\nsummary.";
+    const { result, lines } = withLogCapture(() =>
+        parseCompressInput({ content: [header] }),
+    );
+    assert.equal(result.ranges.length, 0);
+    const rejected = ACP_INPUT_LINES(lines).filter((l) => l.includes("rejected:"));
+    assert.equal(rejected.length, 1);
+    assert.ok(rejected[0]!.includes("preview="), `missing preview in: ${rejected[0]}`);
+    // The exact offending bytes are on the line — no more guessing from retries.
+    assert.ok(rejected[0]!.includes("m00150 => m00168 topic"));
+});
+
+test("#6071 preview is bounded: a long offending entry is truncated, not dumped", () => {
+    const header = `m00150 => m00168 topic\n${"x".repeat(800)}`;
+    const { lines } = withLogCapture(() => parseCompressInput({ content: [header] }));
+    const rejected = ACP_INPUT_LINES(lines).filter((l) => l.includes("rejected:"));
+    assert.equal(rejected.length, 1);
+    assert.ok(rejected[0]!.includes("preview="));
+    assert.ok(!rejected[0]!.includes("x".repeat(200)), "preview must not carry the full payload");
+});
+
+test("#6071 rejected OBJECT entry logs no preview (nothing string-shaped to show)", () => {
+    // Summary-less object entry: rejected for missing summary, but there is no
+    // raw text whose shape matters — keys+reasons already name it.
+    const { lines } = withLogCapture(() =>
+        parseCompressInput({ content: [{ startId: "m00001", endId: "m00003" }] }),
+    );
+    const rejected = ACP_INPUT_LINES(lines).filter((l) => l.includes("rejected:"));
+    assert.equal(rejected.length, 1);
+    assert.ok(!rejected[0]!.includes("preview="), `unexpected preview: ${rejected[0]}`);
+});