storybook: Storybook does not show any stories!

I tried adding Storybook into a newer project. I have used Storybook before, but the last version I was running was 5.3.18. Today I did a fresh install. But after everything was set up and running, the Storybook app does not show many any of the created stories:

The main.js looks like this:

module.exports = {
  stories: [
    '../src/**/*.stories.js'
  ],
  addons: [
    '@storybook/addon-essentials',
    '@storybook/addon-links'
  ],
}

I have now 1 very simple story in my project that should show up as configured:

The path to it is ./src/common/components/Badge/Badge.stories.js from the project root. Storybook runs without an issue:

And the story is also very simple:

import { Badge } from './Badge';

export default {
  title: 'Badge',
  component: Badge,
};

There are no errors reported or anything that could lead me to any potential cause.