fix(watch): remove instance unmounted short circuit in getter of `wat…

…chEffect`

packages/runtime-core/src/apiWatch.ts

@@ -5,7 +5,6 @@ import {
   ReactiveEffect,
   ReactiveFlags,
   type Ref,
-  getCurrentScope,
   isReactive,
   isRef,
   isShallow,
@@ -220,9 +219,7 @@ function doWatch(
     )
   }
 
-  const instance =
-    getCurrentScope() === currentInstance?.scope ? currentInstance : null
-  // const instance = currentInstance
+  const instance = currentInstance
   let getter: () => any
   let forceTrigger = false
   let isMultiSource = false
@@ -259,9 +256,6 @@ function doWatch(
     } else {
       // no cb -> simple effect
       getter = () => {
-        if (instance && instance.isUnmounted) {
-          return
-        }
         if (cleanup) {
           cleanup()
         }