Version

3.1.0-beta.2

Steps to reproduce

When a child component uses Script Setup，I try to get the child instance through refs, I get an empty object

//parent.vue

template> child ref="sonRef" /> button @click="handle">get</button template>

What is expected?

When a child component uses Script Setup, an instance of the child component can be obtained through refs

What is actually happening?

You can't get a child component instance when a child uses Script Setup, but you can get instance data when a child uses DefineComponent ({setUp (){}})

Open a new issue with a boiled down reproduction at https://sfc.vuejs.org See https://new-issue.vuejs.org/?repo=vuejs/vue-next#why-repro

https://sfc.vuejs.org/#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

@posva Please see this.

https://github.com/vuejs/vue-next/commit/0e59770b9282992f6a5af4d8fef33dafb948fc8b