diff --git a/apps/server/test/threads/thread-send-dispatch.test.ts b/apps/server/test/threads/thread-send-dispatch.test.ts
index 9245cfa05..d4a076921 100644
--- a/apps/server/test/threads/thread-send-dispatch.test.ts
+++ b/apps/server/test/threads/thread-send-dispatch.test.ts
@@ -313,6 +313,56 @@ describe("user message telemetry", () => {
 });
 
 describe("turn submit failure settlement", () => {
+  it("issue 2370 keeps a live thread active after a pending-start refusal", async () => {
+    await withTestHarness(async (harness) => {
+      const { environment, thread } = seedProviderThreadFixture({
+        harness,
+        status: "active",
+        value: 2370,
+      });
+      seedTurnStarted(harness.deps, {
+        environmentId: environment.id,
+        providerThreadId: "provider-send-dispatch-2370",
+        sequence: 3,
+        threadId: thread.id,
+        turnId: "turn-still-healthy",
+      });
+      const activeThread = getThread(harness.db, thread.id);
+      if (!activeThread) throw new Error("Expected an active thread");
+
+      await sendThreadMessage(harness.deps, {
+        environment,
+        payload: {
+          input: textInput("send while the first turn is still starting"),
+          mode: "auto",
+          model: "gpt-5",
+          permissionMode: "full",
+          reasoningLevel: "medium",
+          serviceTier: "default",
+        },
+        thread: activeThread,
+        trigger: "user",
+      });
+      const queued = await waitForQueuedCommand(
+        harness,
+        (candidate) =>
+          candidate.command.type === "turn.submit" &&
+          candidate.command.threadId === thread.id,
+      );
+      await reportQueuedCommandError(harness, queued, {
+        errorCode: "command_failed",
+        errorMessage:
+          `Refusing to start a competing turn while ${thread.id} is still starting`,
+      });
+
+      const eventTypes = listEvents(harness.db, {
+        threadId: thread.id,
+      }).map((event) => event.type);
+      expect.soft(eventTypes).not.toContain("system/error");
+      expect.soft(getThread(harness.db, thread.id)?.status).toBe("active");
+    });
+  });
+
   it("records a terminal rejection for the failed client request", async () => {
     await withTestHarness(async (harness) => {
       const { environment, thread } = seedProviderThreadFixture({