`$el` in nested HOC won't change when the child component's root element changes

[twodogwang]

Version

2.6.14

Reproduction link

codepen.io

Steps to reproduce

Open link,click true then check the console

What is expected?

component-a $el as same as it's $vnode's elm when component-c data changes

What is actually happening?

compoent-a $el won't change