This is a minimal reproduction of a component library based on MUI that will generate react unique key errors if you attempt to render the Checkbox or Tooltip (as well as other components).
To reproduce the error, clone the library to your local machine and then npm ci to load the dependencies.
Next, run npm run build:prod to create a production bundle, and then use npm link to run the library against a fresh React app via Create-react-app or something similar.
Within your fresh React application, just import the Tooltip and Checkbox components from this library while linked and then render them to the page. You will see the react errors.
While linked, you can then run npm run build:dev to generate a development build. The Tooltip and Checkbox in you React app should no longer throw the unique key errors in the console.