addon-info show Unknown component names

Describe the bug When i run build-storybook after upgrade from 4.0.8 to 4.1.0-alpha.8 addon-info show me in Story Source section code like this:

<Unknown>
  <Unknown>
    <Text>
      Enter
    </Text>
  </Unknown>
</Unknown>

Expected behavior before upgrade code was like below

<Background>
  <Button>
    <Text>
      Enter
    </Text>
  </Button>
</Background>

and i use custom .storybook/.babelrc file with

   plugin:  "add-react-displayname"

System: “@storybook/addon-info”: “4.1.0-alpha.8”, “@storybook/addon-knobs”: “4.1.0-alpha.8”, “@storybook/addon-options”: “4.1.0-alpha.8”, “@storybook/cli”: “4.1.0-alpha.8”, “@storybook/react”: “4.1.0-alpha.8”, “react-scripts”: “2.1.1”,

[igor-dv]

Please check later versions of Storybook, it was already fixed.

[VdeVentura]

I just noticed that the issue arises when u define your components something like:

export default () => {}

but if you do something like:

const NamedComponent = () => {}
export default NamedComponent

it gets fixed