New source found from dndbeyond.com

ddb_main/node_modules/@mui/material/Paper/Paper.js

@@ -12,7 +12,7 @@ import composeClasses from '@mui/utils/composeClasses';
 import { alpha } from '@mui/system/colorManipulator';
 import styled from '../styles/styled';
 import getOverlayAlpha from '../styles/getOverlayAlpha';
-import useThemeProps from '../styles/useThemeProps';
+import { useDefaultProps } from '../DefaultPropsProvider';
 import useTheme from '../styles/useTheme';
 import { getPaperUtilityClass } from './paperClasses';
 import { jsx as _jsx } from "react/jsx-runtime";
@@ -59,7 +59,7 @@ const PaperRoot = styled('div', {
   }));
 });
 const Paper = /*#__PURE__*/React.forwardRef(function Paper(inProps, ref) {
-  const props = useThemeProps({
+  const props = useDefaultProps({
     props: inProps,
     name: 'MuiPaper'
   });