Version

3.1.5

Reproduction link

https://codesandbox.io/s/vant-issue-moban-forked-vgvnn

Steps to reproduce

1.点击首页的“进入测试页”按钮进入表单页 2.点击第二个单选项 3.点击“Next”按钮 4.点击“返回”按钮 5.点击任意“单选项”，报错

What is expected?

normal

What is actually happening?

error

vant

https://github.com/youzan/vant/issues/9160

Your reproduction is not minimal, please read and follow https://new-issue.vuejs.org/?repo=vuejs/vue-next#why-repro when reporting a bug. Most bugs should be reproducible with the SFC Playground.

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