TLDR: Uninstall Vetur and keep Volar (the official recommended extension).
Volar is an official VScode plugin that was used a few months ago, so the core team is pushing for an officially supported plugin.
It originally worked with Vue3, but will also work with Vue2.
In the VScode extension, find "Vetur" and disable it. Reload VScode
Or you can use "Vetur" @volar-plugins/vetur in another way.
TLDR: Uninstall Vetur and keep Volar (the official recommended extension).
Volar is an official VScode plugin that was used a few months ago, so the core team is pushing for an officially supported plugin.
It originally worked with Vue3, but will also work with Vue2.
As described below: https://vuejs.org/guide/typescript/ Overview.html#ide-support
There is also this github issue: https://github.com/vuejs/vetur /issues/3476#issue-1300202219
By the way, the official page of the project