diff --git a/src/auto-reply/reply/reply-utils.test.ts b/src/auto-reply/reply/reply-utils.test.ts
index 255145e11c8..df7abb4cb24 100644
--- a/src/auto-reply/reply/reply-utils.test.ts
+++ b/src/auto-reply/reply/reply-utils.test.ts
@@ -600,16 +600,6 @@ describe("createReplyReferencePlanner", () => {
     expect(planner.use()).toBeUndefined();
   });
 
-  it("uses existingId on every call when mode is all", () => {
-    const planner = createReplyReferencePlanner({
-      replyToMode: "all",
-      existingId: "thread-1",
-      startId: "parent",
-    });
-    expect(planner.use()).toBe("thread-1");
-    expect(planner.use()).toBe("thread-1");
-  });
-
   it("honors allowReference=false", () => {
     const planner = createReplyReferencePlanner({
       replyToMode: "all",