diff --git a/src/renderer/src/components/terminal-pane/sleeping-record-park-exemption.ts b/src/renderer/src/components/terminal-pane/sleeping-record-park-exemption.ts
index 78d3053a595..5d9b97174eb 100644
--- a/src/renderer/src/components/terminal-pane/sleeping-record-park-exemption.ts
+++ b/src/renderer/src/components/terminal-pane/sleeping-record-park-exemption.ts
@@ -5,7 +5,7 @@ import { createWorktreeRecordSelector } from '@/store/worktree-record-selector-c
 
 const EMPTY_TAB_IDS: ReadonlySet<string> = new Set()
 
-export type SleepingRecordParkExemptionState = {
+type SleepingRecordParkExemptionState = {
   sleepingAgentSessionsByPaneKey?: Record<string, SleepingAgentSessionRecord> | undefined
 }
 
@@ -28,7 +28,6 @@ export const selectSleepingRecordParkExemptTabIds = createWorktreeRecordSelector
 >({
   readSources: (state) => [state.sleepingAgentSessionsByPaneKey],
   empty: EMPTY_TAB_IDS,
-  isEmpty: (tabIds) => tabIds.size === 0,
   build: (state, worktreeId) => {
     const sleepingAgentSessionsByPaneKey = state.sleepingAgentSessionsByPaneKey
     if (!sleepingAgentSessionsByPaneKey) {
diff --git a/src/renderer/src/store/worktree-record-selector-cache.ts b/src/renderer/src/store/worktree-record-selector-cache.ts
index 5e3c004b729..83b054b04d7 100644
--- a/src/renderer/src/store/worktree-record-selector-cache.ts
+++ b/src/renderer/src/store/worktree-record-selector-cache.ts
@@ -6,6 +6,14 @@ type WorktreeRecordGeneration<TValue> = {
   byWorktreeId: Map<string, TValue>
 }
 
+/** Why not `Object.keys`: a `Set`/`Map` value has none, so the default check
+ *  would collapse every non-empty one onto the shared empty identity. */
+function isEmptyValue(value: object): boolean {
+  return value instanceof Set || value instanceof Map
+    ? value.size === 0
+    : Object.keys(value).length === 0
+}
+
 function sameSources(previous: readonly unknown[], next: readonly unknown[]): boolean {
   if (previous.length !== next.length) {
     return false
@@ -34,8 +42,6 @@ export function createWorktreeRecordSelector<TState, TValue extends object>(opti
   readSources: (state: TState) => readonly unknown[]
   build: (state: TState, worktreeId: string) => TValue
   empty: TValue
-  /** Override for values whose emptiness is not `Object.keys` — a Set, for instance. */
-  isEmpty?: (value: TValue) => boolean
 }): (state: TState, worktreeId: string) => TValue {
   let generation: WorktreeRecordGeneration<TValue> | null = null
   return (state, worktreeId) => {
@@ -54,7 +60,7 @@ export function createWorktreeRecordSelector<TState, TValue extends object>(opti
     const built = options.build(state, worktreeId)
     const carried = generation.carried?.get(worktreeId)
     let value = built
-    if (options.isEmpty ? options.isEmpty(built) : Object.keys(built).length === 0) {
+    if (isEmptyValue(built)) {
       value = options.empty
     } else if (carried && shallow(carried, built)) {
       value = carried