jekyll: Jekyll build --watch suddenly started to silently crash on windows

• 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/

–

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

• I was trying to build.

My Reproduction Steps

Run jekyll serve, or jekyll build --watch. These worked up until yesterday, and I am sure I did not edit the config or install anything new since then.

This may be related to #5462, and I have tried all the suggestions there, including the following:

• updated from jekyll 3.3.1 to 3.5.1
• ensured wdm gem is installed
• ran gem clean and then bundle install
• ran jekyll clean
• moved project to a new folder and completely rebuilt
• run commands as ‘bundle exec jekyll build --watch’
• ran the commands with --safe, --trace and --verbose options

D:\Web\my_site> bundle exec jekyll build --watch
Configuration file: D:/Web/my_site/_config.yml
            Source: D:/Web/my_site
       Destination: D:/Web/my_site/_site
 Incremental build: disabled. Enable with --incremental
      Generating...
                    done in 5.729 seconds.
 Auto-regeneration: enabled for 'D:/Web/my_site'

// then after around 5 seconds crashes to
D:\Web\my_site>

However, I did make a completely clean blog and build --watch works there. I’ll continue to work on this and report back if I find a solution.

The Output I Wanted

I’m finding it very hard to track down the issue here, as there are no errors logged. It may be that I’ve included something stupid in my site somewhere - but the real bug / issue is the lack of error reporting.

/cc @jekyll/build