diff --git a/ui/src/components/IssueRunLedger.test.tsx b/ui/src/components/IssueRunLedger.test.tsx
index 5b6dba5a9b4..f4df9493c67 100644
--- a/ui/src/components/IssueRunLedger.test.tsx
+++ b/ui/src/components/IssueRunLedger.test.tsx
@@ -1,7 +1,7 @@
 // @vitest-environment jsdom
 
-import { act } from "react";
 import type { ComponentProps, ReactNode } from "react";
+import { flushSync } from "react-dom";
 import { createRoot, type Root } from "react-dom/client";
 import type { ActivityEvent, Issue, RunLivenessState } from "@paperclipai/shared";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
@@ -30,13 +30,13 @@ beforeEach(() => {
 });
 
 afterEach(() => {
-  act(() => root.unmount());
+  flushSync(() => root.unmount());
   container.remove();
   vi.useRealTimers();
 });
 
 function render(ui: ReactNode) {
-  act(() => {
+  flushSync(() => {
     root.render(ui);
   });
 }
@@ -469,7 +469,7 @@ describe("IssueRunLedger", () => {
       (button) => button.textContent?.includes("Continue monitoring"),
     );
     expect(continueButton).not.toBeUndefined();
-    act(() => {
+    flushSync(() => {
       continueButton?.dispatchEvent(new MouseEvent("click", { bubbles: true }));
     });
     expect(onWatchdogDecision).toHaveBeenCalledWith({
diff --git a/ui/src/components/WorktreeRunEngineBanner.test.tsx b/ui/src/components/WorktreeRunEngineBanner.test.tsx
index 95ffc674c88..702187261e4 100644
--- a/ui/src/components/WorktreeRunEngineBanner.test.tsx
+++ b/ui/src/components/WorktreeRunEngineBanner.test.tsx
@@ -29,6 +29,8 @@ function armed(overrides: Partial<WorktreeRunEngineStatus> = {}): WorktreeRunEng
       armed: true,
       cutoff: "2026-07-10T18:34:00.000Z",
       activationInstanceId: "nonce-aaaaaaaa1111",
+      instanceNonce: "nonce-aaaaaaaa1111",
+      seedEpoch: "epoch-bbbbbbbb2222",
       reason: null,
     },
     instanceNonce: "nonce-aaaaaaaa1111",
diff --git a/ui/src/pages/InstanceExperimentalSettings.test.tsx b/ui/src/pages/InstanceExperimentalSettings.test.tsx
index 73021cbefcb..5137ecb446e 100644
--- a/ui/src/pages/InstanceExperimentalSettings.test.tsx
+++ b/ui/src/pages/InstanceExperimentalSettings.test.tsx
@@ -103,6 +103,7 @@ function defaultExperimentalSettings(): InstanceExperimentalSettingsPayload {
     enableSandboxDuplexBridge: false,
     enableWorktreeRunExecution: false,
     worktreeRunExecutionInstanceNonce: null,
+    worktreeRunExecutionSeedEpoch: null,
     worktreeRunExecutionActivatedAt: null,
     worktreeRunExecutionActivationInstanceId: null,
   };