VSCode: CSS variable style props caused "identifier expected" error

[hungtcs]

Describe the bug
REPL: https://svelte.dev/repl/a8a2621ccad241bfa492d2a0502170c7?version=3.35.0

Working well on REPL, but not working on VSCode with Svelte for VSCode.

To Reproduce
Steps to reproduce the behavior:

<script>
  import Nested from './Nested.svelte';
</script>

<Nested name="Svelte" --text-color="red"/>

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

System (please complete the following information):

• OS: elementary OS 5.1.7 Hera
• IDE: VSCode
• Plugin/Package: Svelte for VSCode