SCSS Autocompletion broken

[sglancer]

• I have searched through existing issues
• I have read through docs
• I have read FAQ
• I have tried restarting VS Code or running Vetur: Restart VLS

Info

• Platform: Windows 10
• Vetur version: 0.30.3
• VS Code version: 1.51.1

Problem

Autocompletion inside a style tag is broken in Vetur version 0.30.3, as shown in the following screenshot.

Pressing tab obviously autocompletes to "marginright: ;", instead of "margin-right". This problem occurs with any CSS property: first option would be exactly what you type.
Reinstalling Vetur/VSC doesn't work. Rolling back to a previous Vetur version (0.30.2) solves this problem.

Reproducible Case

• Open a .vue file
• In the <style> tag, try to autocomplete any CSS property.

[XiongAmao]

I have the same problem. v_0.30.2 does not have this problem.
Compare v_0.30.3 and v_0.30.2, it seems that the vscode-emmet-helper (2.0.9 -> 2.1.2) update is causing the problem.
v0.30.2...v0.30.3