[Bug]: Adding a decorator breaks Show Code view

[grish92]

Describe the bug

When adding decorator withHeadless in the Preview file, the Show Code view in the Docs View is breaking.
Showcode with withHeadless decorator

Showcode without withHeadless decorator

To Reproduce

npm packages:
"@storybook/addon-docs": "^6.5.16",
"@storybook/addon-essentials": "6.5.16",
"@storybook/addon-interactions": "6.5.16",
"@storybook/addon-links": "6.5.16",
"@storybook/addon-postcss": "2.0.0",
"@storybook/builder-webpack5": "6.5.16",
"@storybook/manager-webpack5": "6.5.16",
"@storybook/react": "6.5.16",

System

No response

Additional context

No response

[shilman]

Please try upgrading to 7.0 https://storybook.js.org/migration-guides/7.0 and track #21649 which should be fixed in the next release or so. Closing this for now.