[Bug] Syntax Highlighting fails for both <template> and <script lang="ts" setup> blocks after upgrading to v3.14

[krigjo25]

Vue - Official extension or vue-tsc version

v3.14

VSCode version

1.106.0

Vue version

3.5.24

TypeScript version

5.9.3

System Info

System:
    OS: Linux 6.17 Garuda Linux
    CPU: (8) x64 Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
    Memory: 25.71 GB / 31.29 GB
    Container: Yes
    Shell: 4.2.1 - /usr/bin/fish
  Binaries:
    Node: 22.19.0 - /usr/local/bin/node
    npm: 11.6.2 - /usr/local/bin/npm
  Browsers:
    Brave Browser: 142.1.84.139

package.json dependencies

"dependencies": {
    "@nuxt/content": "^3.8.0",
    "@nuxt/fonts": "^0.12.1",
    "@nuxt/icon": "^2.1.0",
    "@nuxt/image": "^2.0.0",
    "@nuxt/scripts": "^0.13.0",
    "@nuxt/test-utils": "^3.20.1",
    "@pinia/nuxt": "^0.11.3",
    "@unhead/vue": "^2.0.19",
    "axios": "^1.10.0",
    "better-sqlite3": "^12.4.1",
    "bootstrap": "^5.3.7",
    "bootstrap-icons": "^1.13.1",
    "netlify-cli": "^23.9.0",
    "nuxt": "^4.2.1",
    "pinia": "^3.0.4",
    "tinacms": "^2.9.0",
    "vue": "^3.5.24",
    "vue-router": "^4.6.3"
  },
  "devDependencies": {
    "@tinacms/cli": "^1.11.0",
    "@types/node": "^24.10.0",
    "@vitejs/plugin-vue": "^6.0.0",
    "@vitejs/plugin-vue-jsx": "^5.0.0",
    "sass": "^1.89.2",
    "standard-version": "^9.5.0",
    "typescript": "^5.9.3",
    "vite": "^7.0.0",
    "vite-plugin-vue-devtools": "^7.7.7"
  }

Steps to reproduce

Steps to reproduce the error

1. Download the latest update.
2. Open a file e.g App.vue

What is expected?

The Vue - Official extension (Volar) should provide correct syntax highlighting for all language regions within a Vue Single File Component (SFC).

Specifically, this includes:

• HTML/Vue syntax highlighting within the block.
• TypeScript syntax highlighting within the <script lang="ts" setup> block.
• JavaScript syntax highlightning within the <script setup> block

What is actually happening?

After upgrading to 3.1.4, the entire .vue-file content, including both <template> & <script> tags, appears as plain text.

Link to minimal reproduction

Just open a random .vue-file

Any additional comments?

Workaround / Temporary Fix

The issue can be temporarily resolved by manually downgrading the Vue - Official extension to the previous version, v3.1.3.

However, the problem automatically reappears when the extension updates back to the faulty version v3.1.4, indicating a regression in the latest release.

[KazariEX]

Please provide a video to reproduce the error.

[krigjo25]

reproduction of volar highlight syntax bug

[KazariEX]

Does this issue still occur after disabling all other extensions?

[krigjo25]

Yes, the issue appears to occur, when other extensions are disabled.
I'm aware there is a known conflict between Ventur and Volar.

And it doesnt seem like a cache conflict either, as the pervious version works.

[KazariEX]

Could you clone this repository and use vscode debugging tools to see if this happens in the extension host? The transition from v3.1.3 to v3.1.4 did not modify any code in the extension, which I believe may be environment related.

[krigjo25]

Sure i'll try that, i'll be back with what i've found later.

[Inori-Lover]

i also face this problem; after an quick try, it seem to related with "vue.server.path" config, rollback to 3.0.8 as workaround temporarily.
please read this comment as quick note, it is too late to debug deep more(in my tz).

[luyanzhan]

I tried multiple projects, none of the code in setup could be highlighted, there was no type hint when mousehovering, there was no error prompt for the plugin, and it returned to normal after rolling back the plugin to version 3.1.3

[so1ve]

I tried multiple projects, none of the code in setup could be highlighted, there was no type hint when mousehovering, there was no error prompt for the plugin, and it returned to normal after rolling back the plugin to version 3.1.3

That's why reproduction, environment info and logs are required to submit an issue.