fix(keep-alive): fix activated hook invocation on nested components (#1743)

fix #1742

packages/runtime-core/src/renderer.ts

@@ -1265,7 +1265,7 @@ function baseCreateRenderer(
       if (!instance.isMounted) {
         let vnodeHook: VNodeHook | null | undefined
         const { el, props } = initialVNode
-        const { bm, m, a, parent } = instance
+        const { bm, m, parent } = instance
         if (__DEV__) {
           startMeasure(instance, `render`)
         }
@@ -1324,6 +1324,9 @@ function baseCreateRenderer(
           }, parentSuspense)
         }
         // activated hook for keep-alive roots.
+        // #1742 activated hook must be accessed after first render
+        // since the hook may be injected by a child keep-alive
+        const { a } = instance
         if (
           a &&
           initialVNode.shapeFlag & ShapeFlags.COMPONENT_SHOULD_KEEP_ALIVE