Update system.ts

Author: johnsoncodehk

packages/reactivity/src/system.ts

@@ -262,6 +262,7 @@ function checkDirty(current: Link): boolean {
   let prevLinks: OneWayLink<Link> | undefined
   let checkDepth = 0
   let dirty: boolean
+  let shallowPropagated = false
 
   top: do {
     dirty = false
@@ -277,6 +278,7 @@ function checkDirty(current: Link): boolean {
           const subs = dep.subs!
           if (subs.nextSub !== undefined) {
             shallowPropagate(subs)
+            shallowPropagated = true
           }
           dirty = true
         }
@@ -309,6 +311,7 @@ function checkDirty(current: Link): boolean {
             current = prevLinks!.target
             prevLinks = prevLinks!.linked
             shallowPropagate(firstSub)
+            shallowPropagated = true
           } else {
             current = firstSub
           }
@@ -327,10 +330,13 @@ function checkDirty(current: Link): boolean {
         current = current.nextDep
         continue top
       }
-      dirty = !!(sub.flags & SubscriberFlags.Dirty)
+      dirty = shallowPropagated && !!(sub.flags & SubscriberFlags.Dirty)
     }
 
-    return dirty || !!(current.sub.flags & SubscriberFlags.Dirty)
+    return (
+      dirty ||
+      (shallowPropagated && !!(current.sub.flags & SubscriberFlags.Dirty))
+    )
   } while (true)
 }