I thought I filed an issue for this but apparently not.

If you have a .vue file open, and you do Save As... and choose a new file name, your new file will be broken permanently until you restart Volar.

The Script tag will have a blue underline with: Virtual script not found, may missing <script lang="ts"> / "allowJs": true / jsconfig.json.

Even though this is the same error message as #1786, it only happens when saving as a new file, with the current version of Volar (1.2.0).