Examples for string types only works for default & bootstrap themes

[inrumi]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

Description

[Description of the bug or feature]
Examples are not showing for these themes:

• material-ui
• antd
• semantic-ui
• fluent-ui

Steps to Reproduce

1. Select examples from the playground
2. Select Material-ui as theme

Expected behavior

[What you expected to happen]
Display the all the examples exactly like with default or bootstrap themes

Actual behavior

[What actually happened]
Displays only saved data from the browser

Version

You can usually get this information in your package.json or in the file URL if you're using the unpkg one.
"@rjsf/core": "^2.4.0" & @rjsf/material-ui": "^2.4.0"