HMR <script setup> change template, output Cannot read property 'style' of null in used v-for

[baihuibo]

Describe the bug

Using 'v-for' in the template comes from the ref object. When changing the template,

the console output error Cannot read property 'style' of null

strange：If you remove the @submit event or style just fine

Reproduction

app.vue

<template>
    <form @submit="" style="margin-top: 20px;"></form>

    <ul>
        <li v-for="item in objRef.list">
            {{item}}
        </li>
    </ul>

   <!-- Just change the template here -->

    <demo ref="objRef"/>
</template>

<script setup>
    import {ref} from 'vue';
    import demo from "./demo.vue";

    export default {
        components: {demo}
    }
    export const objRef = ref({});
</script>

demo.vue

<template>
    <h1>demo comp</h1>
</template>

<script setup>
    export default {
        props: ['msg'],
    }
    export const list = ['a', 'b', 'c'];
</script>

System Info

• required vite version: 1.0.0-rc.3
• required Operating System: windows 10
• required Node version: v12.16.1
• Optional:
  • npm/yarn version
  • Installed vue version (from yarn.lock or package-lock.json)
  • Installed @vue/compiler-sfc version 3.0.0-rc.4