jekyll: Windows Incompatible character encodings: Windows-1252 and UTF-8, even though all files are UTF-8 (No BOM)

• I believe this to be a bug, not a question about using Jekyll.
• I updated to the latest Jekyll (or) if on GitHub Pages to the latest github-pages
• I read the CONTRIBUTION file at https://jekyllrb.com/docs/contributing/

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• I am on (or have tested on) Windows 10+ (Windows issue only)

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• I was trying to build.

My Reproduction Steps

For the respository schpaper/schpaper.github.io, the build fails on Windows due to incompatable encodings. I have run many commands, including dos2unix and iconv to convert all files to utf-8. I have also tried running the build (Using bundle exec jekyll build) in Git Bash and CMD, with CMD using 'chcp 65001`, and the build still fails due to the following error:

bundle exec jekyll build
Configuration file: D:/shafe/Documents/Dev/schpaper.github.io/_config.yml
            Source: D:/shafe/Documents/Dev/schpaper.github.io
       Destination: D:/shafe/Documents/Dev/schpaper.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
  Liquid Exception: incompatible character encodings: Windows-1252 and UTF-8 in /_layouts/club.html
jekyll 3.3.0 | Error:  incompatible character encodings: Windows-1252 and UTF-8

The Output I Wanted

This build should not fail. None of the files have BOM headers, and they are all UTF-8.

/cc @jekyll/build and @jekyll/windows