[material-ui] defaultProps ignored when using theme scoping

[bromanazzi]

Steps to reproduce

Link to live example: https://codesandbox.io/p/sandbox/x7mc5q

Current behavior

Button renders as size medium by default

Expected behavior

Button should render as size small, since no size was specified

Context

No response

Your environment

npx @mui/envinfo

  Don't forget to mention which browser you used.
  Output from `npx @mui/envinfo` goes here.

Search keywords: theme defaultProps scoping

[github-actions]

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