vnode props can't be accessed from parent

[lzhoucs]

Version

3.0.0-beta.12

Reproduction link(either one of the following)

• mergeProps approach: https://codepen.io/lzhoucs/pen/MWaBMLz
• cloneVNode approach: https://codepen.io/lzhoucs/pen/OJywezp

Steps to reproduce

• Go to one of the reproduction links above(neither works as expected)
• Click on one of the two tabs
• Check console log

What is expected?

true/false is logged

What is actually happening?

undefined is logged

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I need to access Tab's active prop inside Tabs, I found no way to do it. This ticket is similar to #1082. This ticket has issue getting child vnode props from parent whereas #1082 had issue setting it.

In both reproduction links, the console.log(vnode.props.active) shows undefined when either tab is clicked, even though vnode.props.active can be set properly from parent now that #1082 is fixed

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