diff --git a/src/review/content-lane/registry-logic.ts b/src/review/content-lane/registry-logic.ts
index 921b018b2e..1d8dc3e913 100644
--- a/src/review/content-lane/registry-logic.ts
+++ b/src/review/content-lane/registry-logic.ts
@@ -929,11 +929,14 @@ export function checkContentLaneDeliverable(
   changedFiles: readonly string[],
   issueTitle?: string,
 ): ContentLaneDeliverableCheck {
-  const matchesSpec = (candidate: string): boolean => spec.entryFilePattern.test(candidate) || (spec.providerFilePattern?.test(candidate) ?? false);
+  // Mirror classifyRegistryPrScope's matchesPattern: test on canonicalize(candidate) while keeping the original
+  // string for anything user-visible (mentionedPath in the public PR comment).
+  const matchesSpec = (candidate: string): boolean =>
+    spec.entryFilePattern.test(canonicalize(candidate)) || (spec.providerFilePattern?.test(canonicalize(candidate)) ?? false);
   const mentionedPath = extractPathTokens(issueText).find(matchesSpec);
   const titleImplies = !mentionedPath && Boolean(issueTitle && spec.issueTitleImpliesEntryPattern?.test(issueTitle));
   if (!mentionedPath && !titleImplies) return { verdict: "not-applicable" };
-  const delivered = changedFiles.some((file) => matchesSpec(canonicalize(file)));
+  const delivered = changedFiles.some((file) => matchesSpec(file));
   if (delivered) return { verdict: "delivered" };
   return { verdict: "missing", mentionedPath: mentionedPath ?? `a registry entry file matching ${spec.entryFilePattern} (implied by this issue's title)` };
 }
diff --git a/test/unit/content-lane-registry-logic.test.ts b/test/unit/content-lane-registry-logic.test.ts
index f017c0798b..d3aa96a353 100644
--- a/test/unit/content-lane-registry-logic.test.ts
+++ b/test/unit/content-lane-registry-logic.test.ts
@@ -669,6 +669,29 @@ describe("checkContentLaneDeliverable (generic, spec-driven — #content-lane-de
     expect(checkContentLaneDeliverable(spec, issueText, ["registry\\subnets\\foo.json"]).verdict).toBe("delivered");
   });
 
+  it("canonicalizes mixed-case issue-body path tokens while preserving the original mentionedPath (#9667)", () => {
+    const issueText = "Add the missing surfaces to Registry/Subnets/Foo.json.";
+    expect(checkContentLaneDeliverable(spec, issueText, ["tests/foo-verify.test.mjs"])).toEqual({
+      verdict: "missing",
+      mentionedPath: "Registry/Subnets/Foo.json",
+    });
+    expect(checkContentLaneDeliverable(spec, issueText, ["registry/subnets/foo.json"])).toEqual({ verdict: "delivered" });
+  });
+
+  it("keeps all-lowercase issue-body path behavior byte-identical (#9667)", () => {
+    const issueText = "Add the missing surfaces to registry/subnets/foo.json.";
+    expect(checkContentLaneDeliverable(spec, issueText, ["tests/foo-verify.test.mjs"])).toEqual({
+      verdict: "missing",
+      mentionedPath: "registry/subnets/foo.json",
+    });
+    expect(checkContentLaneDeliverable(spec, issueText, ["registry/subnets/foo.json"])).toEqual({ verdict: "delivered" });
+  });
+
+  it("stays not-applicable when the issue body names a path that matches no spec pattern (#9667)", () => {
+    const issueText = "Update the docs at Docs/Guides/Setup.md.";
+    expect(checkContentLaneDeliverable(spec, issueText, ["tests/unrelated.test.mjs"])).toEqual({ verdict: "not-applicable" });
+  });
+
   it("is not-applicable for a spec with no providerFilePattern configured, even if the issue mentions an entry-shaped path (guards the optional-chaining branch)", () => {
     const entryOnlySpec: RegistryLaneSpec = { entryFilePattern: SUBNET_ENTRY_PATTERN, collectionField: "surfaces" };
     const issueText = "Add registry/subnets/foo.json.";