[v6] Skeleton component doesn't work

[trungutt]

Steps to reproduce

Working in v5: https://v5.mui.com/material-ui/react-skeleton/#wave-example

Not working in v6: https://next.mui.com/material-ui/react-skeleton/#wave-example

Current behavior

v6 Skeleton seems broken

Expected behavior

v6 Skeleton should work as v5

Context

We are using Sketelon component and we couldn't move to MUI v6.0.0

Your environment

npx @mui/envinfo

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

Search keywords: v6

[DiegoAndai]

Hey @trungutt, thanks for the report. This is a duplicate of #43470, fixed in #43474. It should be out in the next patch release.