How to debug why this module isn't working

Maybe related to 🐛 Cannot have div tags inside columns in CKEditor 5 Active ?

Thanks for the reply.
I don't think this is the reason. I didn't add any divs or anything, and it works when doing the same on a new installation without any additional modules. So I think this is caused by another module.

It would be helpful if I could get the js file before it's minified, or some info on how it's built.

@m-p-j You can see the source here: https://git.drupalcode.org/project/ckeditor_bs_grid/-/tree/2.0.x/js/cked...

You can build this code on your machine with yarn, from the module root, run yarn install to get all the dependencies, and then yarn run build to compile. It's using the webpack config in that same folder, so you can do whatever you like there to debug.