[Bug Report] Use dynamic Tags (ELTag) in Vue of 2.6.9 version or above, add tags has no dynamic effect.

[monkeycf]

Element UI version

2.11.1

OS/Browsers version

window10/Chrome75.0

Vue version

2.6.9

Reproduction Link

https://codepen.io/CHENSENRAN/pen/NQpZEm

Steps to reproduce

在2.6.9及以上版本的Vue中使用ElementUI动态编辑标签。(Vue版本2.6.8及以下没有此问题）
Element UI 官方文档链接：https://element.eleme.cn/?#/zh-CN/component/tag#dong-tai-bian-ji-biao-qian

What is Expected?

在添加关闭标签时，可以有动画效果。

What is actually happening?

只有关闭标签时有动画效果，在添加标签时没有动画效果。

[element-bot]

Translation of this issue:

Element UI version

2.11.1

OS/Browsers version

Windows 10/Chrome 75.0

Vue version

2.6.9

Reproduction Link

Https://codepen.io/CHENSENRAN/pen/NQpZEm

Steps to reproduce

Use ElementUI to dynamically edit tags in Vue versions 2.6.9 and above. (Vue version 2.6.8 and below does not have this problem)

Element UI official documentation link: https://element.eleme.cn/?#/zh-CN/component/tag#dong-tai-bian-ji-biao-qian

What is Expected?

When you add closing tags, you can animate them.

What is actually happening?

Only when the label is closed, there is animation effect, but when the label is added, there is no animation effect.

[ziyoung]

这里有一个更简单的例子。https://codepen.io/ziyoung/pen/bXrxMZ
看了一下 changelog 也没啥特别的。我再排查一下。

[ziyoung]

跟这个 pr 有关 vuejs/vue#9668

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.