Exec bundle jekyll serve is not loading from _plugins, but

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bundle exec jekyll serve, the plugins are not loaded, and an error occurs. When I run bundle exec jekyll serve –plugins _plugins, the plugins are loaded and everything works.

I am doing all this in a docker container, where the site source is in /site. I have verified that the CWD at the time of the bundle command is /site and that the _plugins directory is present there. It just appears that jekyll is not looking at it, unless I specify it as a CLI argument.

If, instead of jekyll serve, I run jekyll build, everything works fine too.

I do not have “safe: true” in the config. I also am not loading any github gems.

What am I missing? The full command being run is:

bundle exec jekyll serve --force_polling --host 0.0.0.0 -p 4000 --watch --config=_config.yml,_config_development.yml

The file _config_development.yml is currently empty. For building:

bundle exec jekyll build --config=_config.yml,_config_production.yml

The file `_config_production.yml` contains:

url: “https://domain.com”
baseurl: “/blog”

sass:
  sass_dir: _sass
  style: compressed
  quiet_deps: true
  #sourcemap: true
  cache: false

This overrides (from _config.yml): baseurl: “”

So, for all intents and purposes, only _config.yml plays a role and is constant between the two.