fix(runtime-core): avoid set ref side effect

[edison1105]

close #7754
close #7768

use test case from #7768

Closing as failing the #6697's test case

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	99.1 kB (+4 B)	37.5 kB (+3 B)	33.8 kB (-21 B)
vue.global.prod.js	157 kB (+4 B)	57.3 kB (+3 B)	51 kB (-63 B)

Usages

Name	Size	Gzip	Brotli
createApp	54.5 kB (+4 B)	21.1 kB (+4 B)	19.3 kB (+4 B)
createSSRApp	58.4 kB (+4 B)	22.8 kB (+4 B)	20.7 kB (-11 B)
defineCustomElement	59.1 kB (+4 B)	22.6 kB (+4 B)	20.6 kB (+7 B)
overall	68.1 kB (+4 B)	26.2 kB (+11 B)	23.8 kB (-18 B)

[pkg-pr-new]

commit: 6ed722d

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@11673

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@11673

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@11673

@vue/compiler-ssr

pnpm add https://pkg.pr.new/@vue/compiler-ssr@11673

@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@11673

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@11673

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@11673

@vue/server-renderer

pnpm add https://pkg.pr.new/@vue/server-renderer@11673

@vue/shared

pnpm add https://pkg.pr.new/@vue/shared@11673

vue

pnpm add https://pkg.pr.new/vue@11673

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@11673

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