Use useForm to verify the dynamic form error, unable to dynamically add rules

[nabaonan]

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

Version

2.2.5

Environment

bigsur 11.5.1

Reproduction link

Steps to reproduce

直接点击验证可以生效，是因为我在规则中配置了，
点击添加一个的时候，会报错，此时我向规则对象中动态添加一个数据，感觉既然是reactive的对象应该是响应式的，但是报错了
假如添加的时候不包含类似index的变量，可以添加成功,但是不会提示错误信息

What is expected?

点击添加按钮的时候，动态添加规则信息可以生效

What is actually happening?

add方法中动态添加规则的时候，报错

[github-actions]

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