[Bug]: Subcomponents doesn't show code preview in docs (v7)

[LucasCaixeta]

Describe the bug

Hello,

We created a component based on MUI modal, with subcomponents (Title, Content & ContentActions):

And created stories to show it like this one:

But, when I ran the storybook and went to docs and show code, I received this as return:

To Reproduce

No response

System

No response

Additional context

npx @mui/envinfo

System:
OS: macOS 12.6.2
Binaries:
Node: 18.12.1 - ~/.nvm/versions/node/v18.12.1/bin/node
Yarn: Not Found
npm: 8.19.2 - ~/.nvm/versions/node/v18.12.1/bin/npm
Browsers:
Chrome: Not Found
Edge: Not Found
Firefox: Not Found
Safari: 16.2
npmPackages:
@emotion/react: ^11.10.5 => 11.10.5
@emotion/styled: ^11.10.5 => 11.10.5
@mui/base: 5.0.0-alpha.112
@mui/core-downloads-tracker: 5.11.2
@mui/material: ^5.11.2 => 5.11.2
@mui/private-theming: 5.11.2
@mui/styled-engine: 5.11.0
@mui/system: 5.11.2
@mui/types: 7.2.3
@mui/utils: 5.11.2
@types/react: ^18.x => 18.0.26
react: ^18.x => 18.2.0
react-dom: ^18.x => 18.2.0
typescript: ^4.9.4 => 4.9.4

[LucasCaixeta]

@Pettrus

[shilman]

@integrayshaun @kasperpeulen did either of you see this while investigating MUI?

@LucasCaixeta can you please share the output of npx sb info?

[ShaunEvening]

@shilman I haven't, no :(