Pug syntax highlighting breaks when attributes have curly braces

Describe the bug
As you can see in the screenshot below, Pug syntax highlighting breaks when attributes have JS values using curly brace syntax. Specifically, when an attribute has curly brace syntax, syntax highlighting breaks for the attributes that come directly after, if they too have curly brace syntax.

To reproduce
Create a .svelte file with the following:

<template lang="pug">
  p Hello world
  Example(one="{24}" two="{2}")
  Example(one="{24}" two="{2}" three='dd' four='{3}' five='{3}')
  Example(one="x{24}" two="{2}")
  Example(one="24" two="2")
</template>

To make sure this wasn't due to some other extension interfering, I opened a clean instance of VSCode by running code . --user-data-dir ./vscodewhatever --extensions-dir ./vscodewhateverext.

Expected behavior
The expected behavior would be for all attributes to have consistent colors.

System

• OS: macOS 10.14.6
• IDE: VSCode 1.52.1
• Plugin/Package: Svelte for VSCode 103.0.0

Reproduce the issue in a .svelte file using the supplied Pug examples, especially adjacent attributes with curly-brace values. Trace the Svelte/Pug syntax-highlighting handling for those attributes; the work is done when all reproduced attributes receive consistent highlighting in VSCode.