jekyll: Jekyll cannot Find my _layouts when I use --config and -s command line args

• 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 ran jekyll doctor to check my configuration
• I read the CONTRIBUTION file at https://jekyllrb.com/docs/contributing/
• This is a feature request.

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• I am on (or have tested on) macOS 10+
• I am on (or have tested on) Debian/Ubuntu GNU/Linux
• I am on (or have tested on) Fedora GNU/Linux
• I am on (or have tested on) Arch GNU/Linux
• I am on (or have tested on) Other GNU/Linux
• I am on (or have tested on) Windows 10+
• I am on (or have tested on) Other FreeBSD

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• I was trying to install.
• There is a broken Plugin API.
• I had an error on GitHub Pages, and I have reproduced it locally.
• I had an error on GitHub Pages, and GitHub Support said it was a Jekyll Bug.
• I had an error on GitHub Pages and I did not test it locally.
• I was trying to build.
• It was another bug.

My Reproduction Steps

First of all, if I lock my jekyll version to 2.4.0, the site builds perfectly fine.

I use a git hook to build my site automatically

REPO="$HOME/git/landing-page.git"
TMP="$HOME/tmp/landing-page"
CONFIG="$TMP/_config.yml"
DEST="$HOME/sites/landing-page"

echo "Cloning..."
git clone $REPO $TMP

echo "Installing gems and building..."
cd $TMP && bundle install

echo "Building..."
bundle exec jekyll build --config $CONFIG -s $TMP -d $DEST

echo "Cleaning up..."
rm -rf $TMP

Which yields me this error:

Configuration file: /home/freebsd/tmp/landing-page/_config.yml
            Source: /home/freebsd/tmp/landing-page
       Destination: /home/freebsd/sites/landing-page
 Incremental build: disabled. Enable with --incremental
      Generating...
Error reading file /usr/home/freebsd/tmp/landing-page/_layouts/compress.html: No such file or directory @ rb_sysopen - /home/freebsd/tmp/landing-page/usr/home/freebsd/tmp/landing-page/_layouts/compress.html
Error reading file /usr/home/freebsd/tmp/landing-page/_layouts/master.html: No such file or directory @ rb_sysopen - /home/freebsd/tmp/landing-page/usr/home/freebsd/tmp/landing-page/_layouts/master.html
                    done in 0.717 seconds.
 Auto-regeneration: disabled. Use --watch to enable.

<strike>Those _layouts do exist, and the paths are correct, but jekyll says it can’t read them, but only on the latest jekyll. Version 2.4.0 works fine.</strike>

Actually, the path looks like it’s getting messed up at some point in jekyll

If I change the hook script to this, it builds correctly even on the latest jekyll:

REPO="$HOME/git/landing-page.git"
TMP="$HOME/tmp/landing-page"
CONFIG="$TMP/_config.yml"
DEST="$HOME/sites/landing-page"

echo "Cloning..."
git clone $REPO $TMP

echo "Installing gems and building..."
cd $TMP && bundle install && bundle exec jekyll build -d $DEST

echo "Cleaning up..."
rm -rf $TMP

So it seems something goes wrong with the paths within jekyll when you specify config and source command line args