Script not work on server side render

[suciptoid]

Describe the bug
When page load in server side render (direct access eg: /dashboard), the script on page not work. But when in client side render (eg: navigating from login page -> dashboard), it work.

The problem occurs when:

• Nested layout (not affected nested route without _layout.svelte)
• Using tailwindcss with svelte-preprocess (when disable tailwind/svelte-preporcess bug not happen)
• Server render only

Logs
No log on server console / client console

To Reproduce
Reproduce: https://github.com/tegalan/sapper-tailwind-bug-reproduce
Video demo: https://github.com/tegalan/sapper-tailwind-bug-reproduce/blob/main/Screen%20Recording%202020-10-30%20at%2022.34.49.mov

Expected behavior
Script work both on client and server render

Stacktraces

Information about your Sapper Installation:

  System:
    OS: macOS 10.15.7
    CPU: (8) x64 Intel(R) Core(TM) i5-8257U CPU @ 1.40GHz
    Memory: 229.14 MB / 8.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 14.10.1 - /var/folders/v5/30n9fn2n3b983y0zb1gjkr400000gn/T/fnm-shell-8541211/bin/node
    npm: 6.14.8 - /var/folders/v5/30n9fn2n3b983y0zb1gjkr400000gn/T/fnm-shell-8541211/bin/npm
  Browsers:
    Chrome: 86.0.4240.111

• Local machine
• Firebase hosting & function

Severity
Blocking some user

Additional context
Maybe related to #1579

[suciptoid]

Additional info: Bug not occur on Firefox browser.

Maybe related to #1585

[suciptoid]

Enabling purgecss solve this issue, closed.

Additional info:
I'm try to reproduce with svelte@next template (snowpack) and don't facing this bug.