动态创建表单在jsx中会丢失值

[RGXMG]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.3.16

Environment

chrome : 72.0.3626.121

Reproduction link

Steps to reproduce

在jsx中，当动态渲染了超过4个(包括4个)以上，从第一个开始一直点击删除时，大约删除2个及以上时就会出现输入的值丢失，且这时在值丢失的输入框内输入内容，会报错。具体在控制台可见，而不超过3个或者从最后一个一直点击删除时，就不会出现值丢失

What is expected?

在jsx中也能正常渲染

What is actually happening?

在template中使用正常，在jsx中出现此类问题

[tangjinzhou]

https://codesandbox.io/s/vue-template-uoeub
添加key

[RGXMG]

https://codesandbox.io/s/vue-template-uoeub
添加key

确实问题出在这里，这是一个不该犯的错误，但是控制台并没有提示我，以至于我忽略了这个key值

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