4.12.1 warnings in console

[jonathan-pyt]

Since the last release : 4.12.1 we get warnings from v5 i guess

Material-UI: the createMuiTheme function was renamed to createTheme.

The prop justify of ForwardRef(Grid) is deprecated. Use justifyContent instead, the prop was renamed.
And a lot of more ... for each component that evolves in v5

• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Steps to Reproduce 🕹

You can check console from website example here :
https://codesandbox.io/s/rbtj4
https://codesandbox.io/s/t4hze (same for labs x-grid / datagrid etc..)

[eps1lon]

Thanks for the feedback. 4.12 includes deprecation warnings relevant to the v5 upgrade. If you don't intend to upgrade to v5 then I suggest rolling back to 4.11.