fix(keep-alive): fix unmounting late-included components

fix #3648
based on #3650

packages/runtime-core/src/components/KeepAlive.ts

@@ -42,6 +42,7 @@ import { setTransitionHooks } from './BaseTransition'
 import { ComponentRenderContext } from '../componentPublicInstance'
 import { devtoolsComponentAdded } from '../devtools'
 import { isAsyncWrapper } from '../apiAsyncComponent'
+import { isSuspense } from './Suspense'
 
 type MatchPattern = string | RegExp | (string | RegExp)[]
 
@@ -323,7 +324,7 @@ const KeepAliveImpl: ComponentOptions = {
       vnode.shapeFlag |= ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE
 
       current = vnode
-      return rawVNode
+      return isSuspense(rawVNode.type) ? rawVNode : vnode
     }
   }
 }