Can't walk dependency graph: cannot find module

I want to make use of the cypress markdown preprocessor.
After installing it with npm:
npm i -D cypress-markdown-preprocessor

and configured the plugin:
/ cypress.config.js
const { defineConfig } = require('cypress')
const mdPreprocessor = require('cypress-markdown-preprocessor')

module.exports = defineConfig({
e2e: {
setupNodeEvents(on, config) {
on('file:preprocessor', mdPreprocessor)
return config
},
// use Markdown file from folder "docs" as tests
specPattern: 'docs/**/*.md',
},
})

I created a first test file, which I ran in Cypress. I got an error:
Can't walk dependency graph: Cannot find module in
node_modules@bahmutovcypress-fiddlesrcindex.js'

That is strange because I have this folder in my node_modules:
node_modules\@bahmutov\cypress-fiddle\src\index.js

So, because there was only one place where I had to fill in a require, at the mdPreprocessor cypress config, I don't know what to do.

Olaf

Start with cypress.config.js and the reported dependency path, then reproduce the npm installation and Cypress run using a Markdown spec under docs/**/*.md. Compare the module-resolution error with node_modules/@bahmutov/cypress-fiddle/src/index.js; done means the Markdown preprocessor loads the spec without the missing-module error.

Written by the indexing model from the issue text.