fix(Teleport): ensure targetAnchor and targetStart not null during hydration

[edison1105]

close #11400

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90 kB (+121 B)	34.5 kB (+68 B)	31.1 kB (+50 B)
vue.global.prod.js	147 kB (+121 B)	54 kB (+58 B)	48 kB (+30 B)

Usages

Name	Size	Gzip	Brotli
createApp	49.6 kB	19.5 kB	17.8 kB
createSSRApp	53.2 kB	20.9 kB	19.1 kB
defineCustomElement	51.9 kB	20.2 kB	18.5 kB
overall	63.1 kB	24.5 kB	22.3 kB

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	❌ failure
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
quasar	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vant	✅ success	✅ success
vite-plugin-vue	❌ failure	✅ success
vitepress	✅ success	✅ success
vue-i18n	❌ failure	❌ failure
vue-macros	❌ failure	✅ success
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success

[yyx990803]

Ecosystem CI failures do not seem to be related to this PR.