Environments:

• Prettier Version: 1.18.2
• Running Prettier via: CLI
• Runtime: node.js v8.15.0
• Operating System: MacOS

Steps to reproduce:

• clone https://github.com/xorik/prettier-pug-vue
• run prettier --write *.vue

Expected behavior:
Template inside the pug.vue should be prettified

Actual behavior:
template inside the pug.vue isn't touched by prettier

If you run prettier --write *.pug, you can see that the plugin itself works perfectly.
The plugin developers suggested to write here: (prettier/plugin-pug#5)