Version

3.2.20

Reproduction link

2.x https://codesandbox.io/s/wonderful-water-unbnt 3.x https://codesandbox.io/s/ecstatic-browser-ibyk2

Steps to reproduce

• add a directive
• bind directive to HelloWorld component
• add a timer in HelloWorld

2.x

3.x

What is expected?

I don't know

What is actually happening?

In 2.x, when HellowWorld updated, the directive's update hook was not be called, but called in 3.x

Is this a bug or a feature

see https://v3.vuejs.org/guide/migration/custom-directives.html#overview