diff --git a/src/renderer/src/store/slices/browser.test.ts b/src/renderer/src/store/slices/browser.test.ts
index 61a534c6194..6a21013962b 100644
--- a/src/renderer/src/store/slices/browser.test.ts
+++ b/src/renderer/src/store/slices/browser.test.ts
@@ -658,6 +658,28 @@ describe('createBrowserSlice runtime guard', () => {
     )
   })
 
+  it('clears the deleted profile partition from referencing tabs so they fall back to the default partition', async () => {
+    // Regression for #6923 follow-up: deleting a profile de-allowlists its
+    // partition in main. A tab still pointing at it would be denied attachment
+    // by will-attach-webview and render blank after restart/remount. The tab
+    // must reset to the allowlisted default partition instead.
+    const store = createTestStore()
+    mockApi.browser.sessionDeleteProfile.mockResolvedValueOnce(true)
+    store.setState({ browserSessionProfiles: [] })
+    const tab = store.getState().createBrowserTab('wt-1', 'https://example.com', {
+      sessionProfileId: 'profile-isolated',
+      sessionPartition: 'persist:orca-browser-session-profile-isolated'
+    })
+
+    await store.getState().deleteBrowserSessionProfile('profile-isolated')
+
+    const updated = store
+      .getState()
+      .browserTabsByWorktree['wt-1']?.find((t) => t.id === tab.id)
+    expect(updated?.sessionProfileId).toBeNull()
+    expect(updated?.sessionPartition).toBeNull()
+  })
+
   it('creates new browser tabs through the owning runtime for desktop remote worktrees', async () => {
     const store = createTestStore()
     store.setState({
diff --git a/src/renderer/src/store/slices/browser.ts b/src/renderer/src/store/slices/browser.ts
index 53d07f58127..3831e9c20e7 100644
--- a/src/renderer/src/store/slices/browser.ts
+++ b/src/renderer/src/store/slices/browser.ts
@@ -349,6 +349,33 @@ function buildWorkspaceFromPage(
   }
 }
 
+// Why: when a session profile is deleted its per-profile partition is removed
+// from the main-process allowlist, so any tab still pointing at it would be
+// denied attachment by will-attach-webview and render blank after a restart or
+// remount (#6923 follow-up). Reset the persisted profile id/partition on those
+// tabs so the webview falls back to the allowlisted default partition, matching
+// the pre-sessionPartition behavior.
+function clearDeletedProfileFromBrowserTabs(
+  browserTabsByWorktree: Record<string, BrowserWorkspace[]>,
+  profileId: string
+): Record<string, BrowserWorkspace[]> {
+  let changed = false
+  const next: Record<string, BrowserWorkspace[]> = {}
+  for (const [worktreeId, tabs] of Object.entries(browserTabsByWorktree)) {
+    let tabsChanged = false
+    const updatedTabs = tabs.map((tab) => {
+      if (tab.sessionProfileId !== profileId) {
+        return tab
+      }
+      tabsChanged = true
+      return { ...tab, sessionProfileId: null, sessionPartition: null }
+    })
+    next[worktreeId] = tabsChanged ? updatedTabs : tabs
+    changed = changed || tabsChanged
+  }
+  return changed ? next : browserTabsByWorktree
+}
+
 function mirrorWorkspaceFromActivePage(
   workspace: BrowserWorkspace,
   pages: BrowserPage[]
@@ -1791,6 +1818,10 @@ export const createBrowserSlice: StateCreator<AppState, [], [], BrowserSlice> =
               s,
               s.browserSessionProfiles.filter((p) => p.id !== profileId)
             ),
+            browserTabsByWorktree: clearDeletedProfileFromBrowserTabs(
+              s.browserTabsByWorktree,
+              profileId
+            ),
             ...(s.defaultBrowserSessionProfileId === profileId
               ? {
                   defaultBrowserSessionProfileId: null,
@@ -1815,6 +1846,10 @@ export const createBrowserSlice: StateCreator<AppState, [], [], BrowserSlice> =
             s,
             s.browserSessionProfiles.filter((p) => p.id !== profileId)
           ),
+          browserTabsByWorktree: clearDeletedProfileFromBrowserTabs(
+            s.browserTabsByWorktree,
+            profileId
+          ),
           ...(s.defaultBrowserSessionProfileId === profileId
             ? {
                 defaultBrowserSessionProfileId: null,