component is accessible by `this` from function declared in `<script setup>` on dev mode

[sapphi-red]

Vue version

3.2.40

Link to minimal reproduction

https://sfc.vuejs.org/#__DEV__eNqNkc9uwjAMxl/FygUQNEHbTqhM7D1yKWkKGc0fJQ7TVPXd57QcgEnTbrH92T/7y8A+QuDXrNmO1UlFExCSxhzepTM2+IgwQNQdjNBFb2FB0oV00invEoLy2SHsi2K5XZV8l51C4x103i9XMEgHpHLJ95r3/rTEs0l8aiP5KF0tZirxKEBtQ9+gpgigbs0VVN+ktJdMNbGVbMpT5ZgRiYHfQVNtjiSDg+qNuhR1AazX1DBvaBIMw23bcazF3PHfadMpNMtnDPl29MOMWtCq9KrF3QFsw2YHK9sE/pm8I48nP+StkCTbzQ6VHDlbYsnOiCHthMguXE7klRUHqolIVGN11Xp7eOUv/G1L1IT3ea6TrY7RfyUdiSjZ5m64oORVxypq1+qo45+wJ+0D8Kn2C1qY9LMjG38AeufSrA==

Steps to reproduce

1. Open reproduction
2. Click output count button

Note that @click="foo()" is using foo(). It work well when this is @click="foo".

What is expected?

Cannot read properties of undefined (reading 'count') error happen on dev too. (it happens on prod)

What is actually happening?

0 will be shown in console on dev

System Info

No response

Any additional comments?

original issue: vitejs/vite#3872