Bug: MDX doesn't recognize CSF's imported from node_modules

To reproduce:

1. pnpm install
2. pnpm run --filter @monorepo/storybook storybook

View the storybook. Note that:

1. The MDX documentation for Button works as expected
2. The MDX documentation for ImportedButton reports "<Meta of={} /> must reference a CSF file module export or meta export"

The imported CSF is covered by the stories glob in main.js, and you can even see the story appear in the sidebar.