fix(compiler-core): detected forwarded slots in nested components (#4268)

fix #4244

Author: Bigfish8

Diff for: packages/compiler-core/__tests__/transforms/vSlot.spec.ts

@@ -778,6 +778,13 @@ describe('compiler: transform component slots', () => {
       )
       expect(slots).toMatchObject(toMatch)
     })
+
+    test('<slot w/ nested component>', () => {
+      const { slots } = parseWithSlots(
+        `<Comp><Comp><slot/></Comp></Comp>`
+      )
+      expect(slots).toMatchObject(toMatch)
+    })
   })
 
   describe('errors', () => {

Diff for: packages/compiler-core/src/transforms/vSlot.ts

@@ -384,9 +384,7 @@ function hasForwardedSlots(children: TemplateChildNode[]): boolean {
       case NodeTypes.ELEMENT:
         if (
           child.tagType === ElementTypes.SLOT ||
-          ((child.tagType === ElementTypes.ELEMENT ||
-            child.tagType === ElementTypes.TEMPLATE) &&
-            hasForwardedSlots(child.children))
+          hasForwardedSlots(child.children)
         ) {
           return true
         }