diff --git a/apps/desktop/src/lib/session-signatures.test.ts b/apps/desktop/src/lib/session-signatures.test.ts
index aeecd19b61..0c4c280c8e 100644
--- a/apps/desktop/src/lib/session-signatures.test.ts
+++ b/apps/desktop/src/lib/session-signatures.test.ts
@@ -4,7 +4,8 @@ import type { SessionInfo } from '@/hermes'
 
 import { sameCronSignature, sessionMessagesSignature } from './session-signatures'
 
-const session = (id: string, title: string | null): SessionInfo => ({ id, title }) as SessionInfo
+const session = (id: string, title: string | null, extra: Partial<SessionInfo> = {}): SessionInfo =>
+  ({ id, title, ...extra }) as SessionInfo
 
 describe('sameCronSignature', () => {
   it('is false when the lengths differ', () => {
@@ -28,6 +29,28 @@ describe('sameCronSignature', () => {
     const b = [session('b', 't'), session('a', 't')]
     expect(sameCronSignature(a, b)).toBe(false)
   })
+
+  // A pin-only page must reach $sessions: session-pin-sync treats the row as
+  // authoritative and releases its write guard when a page confirms the value
+  // it wrote. Gating that page out froze the row and re-pinned what the user
+  // had just unpinned (#76919).
+  it('is false when only the pinned flag changed', () => {
+    const a = [session('a', 't', { pinned: true })]
+    const b = [session('a', 't', { pinned: false })]
+    expect(sameCronSignature(a, b)).toBe(false)
+  })
+
+  it('is false when only the archived flag changed', () => {
+    const a = [session('a', 't', { archived: false })]
+    const b = [session('a', 't', { archived: true })]
+    expect(sameCronSignature(a, b)).toBe(false)
+  })
+
+  it('is true when both flags match', () => {
+    const a = [session('a', 't', { archived: false, pinned: true })]
+    const b = [session('a', 't', { archived: false, pinned: true })]
+    expect(sameCronSignature(a, b)).toBe(true)
+  })
 })
 
 describe('sessionMessagesSignature', () => {
diff --git a/apps/desktop/src/lib/session-signatures.ts b/apps/desktop/src/lib/session-signatures.ts
index 4ef20e1fab..fac4725422 100644
--- a/apps/desktop/src/lib/session-signatures.ts
+++ b/apps/desktop/src/lib/session-signatures.ts
@@ -23,7 +23,14 @@ export function sameCronSignature(a: SessionInfo[], b: SessionInfo[]): boolean {
       session.preview === other.preview &&
       session.message_count === other.message_count &&
       session.last_active === other.last_active &&
-      session.ended_at === other.ended_at
+      session.ended_at === other.ended_at &&
+      // Row STATE, not just row content: session-pin-sync reconciles the
+      // sidebar's pins against `pinned` on the rows in this atom, so a page
+      // whose only delta is a flag has to swap in or the reconciler reads a
+      // frozen copy forever. An idle conversation never moves any of the
+      // fields above again, which is exactly when a pin gets toggled (#76919).
+      session.pinned === other.pinned &&
+      session.archived === other.archived
     )
   })
 }