4.12.1 Invalid Type Warning on DataGrid / XGrid

[jonathanstanley]

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

Current Behavior 😯

console throws warning in both DataGrid and XGrid:

Warning: Failed prop type: Invalid prop `modifiers` of type `array` supplied to `ForwardRef(Popper)`, expected `object`.

This error only in DataGrid:

Material-UI: The key `selectLabel` provided to the classes prop is not implemented in ForwardRef(TablePagination).

Expected Behavior 🤔

Probably no warning. The error does not appear in v5.

Steps to Reproduce 🕹

see console: https://codesandbox.io/s/hungry-boyd-d4x63
very simple DataGrid and XGrid

Context 🔦

This appears to be caused by this code: https://github.com/mui-org/material-ui-x/blob/b88f9ef7730b2de97de7fdbd1e9e1ff2b7405fce/packages/grid/_modules_/grid/components/panel/GridPanel.tsx#L53-L60 added from pull #855 (the old version doesn't take this array, so this checker is trying to determine old/new version). a few other places also rely on the isMuiV5 checker.

But the checker may not be making the right call because it is just relying on the alpha property
https://github.com/mui-org/material-ui-x/blob/ef14e9ee8fde442576ba32279ad7a625dc99c4d2/packages/grid/_modules_/grid/utils/utils.ts#L24-L26
alpha preemptively added to v4.12.0 to help people transition (see mui/material-ui#22837)

Your Environment 🌎

see codesandbox

[oliviertassinari]

Duplicate of #2106