fix(core): fix cmdk not show current page (#6031)

packages/common/infra/src/livedata/react.ts

@@ -7,10 +7,14 @@ function noopSubscribe() {
   return () => {};
 }
 
-function noopGetSnapshot() {
+function nullGetSnapshot() {
   return null;
 }
 
+function undefinedGetSnapshot() {
+  return undefined;
+}
+
 /**
  * subscribe LiveData and return the value.
  */
@@ -25,7 +29,11 @@ export function useLiveData<Input extends LiveData<any> | null | undefined>(
   : never {
   return useSyncExternalStore(
     liveData ? liveData.reactSubscribe : noopSubscribe,
-    liveData ? liveData.reactGetSnapshot : noopGetSnapshot
+    liveData
+      ? liveData.reactGetSnapshot
+      : liveData === undefined
+        ? undefinedGetSnapshot
+        : nullGetSnapshot
   );
 }