Can't fold code in template region with pug

• I have searched through existing issues
• I have read through docs
• I have read FAQ

Info

• Platform: macOS
• Vetur version: v0.27.3
• VS Code version: 1.59.1

Problem

Can't collapse code in template region with lang="pug" (similar to https://github.com/vuejs/vetur/issues/2234)

Reproducible Case

Create vue template like this:

<template lang="pug">
  .parent
    .children
      .grand-children
        p sometext
      .grand-children
        p sometext
</template>

Without vetur it will collapse as expected, but not with vetur enabled.