To reproduce:
Install:

npx create-react-app bug-demo
npm install --save-dev styled-jsx
npm install --save-dev sass @styled-jsx/plugin-sass

Add some styled-jsx (CRA-style):

<style jsx="true">
// whatever style...
</style>

Current behavior:

As you can see there is no syntax highlighting

Babel or Create React App (IDK) requires me to add jsx="true" otherwise it will through an error

Expected behavior:

I want what the plugin is supposed to do 😊
Syntax highlighting
Environment information:

• VSCode version: 1.71.2
• vscode-styled-jsx version: 2.1.1
• styled-jsx version: 5.0.7