storybook: Story roots not working as expected with 5.3

Describe the bug I have several stories in the form of Root/Story || Root/Submenu/Story || Root/Submenu/Submenu/Story Before 5.3, this worked fine with the different hierarchy specifiers I could use. Just trying to recreate that in the new setup.

Example Story Names Being Used

• Introduction/Getting Started
• Introduction/Framework Integration/React
• Design System/Components/Button

Below screenshot is how they currently show up. Would expect Design System to also be a root level and not within Others. Can’t share my repo, but will try and share whatever I can.

Also using the sort function within the preview.js file.

 storySort: ([first], [second]) => {
      const [firstType] = first.split('-');
      const [secondType] = second.split('-');

      if (firstType === 'introduction') return -1;
      if (firstType === secondType) return 0;

      return 1;
    }