I am trying to create custom variants of the Alert component from MUI, but am unable to do this: https://codesandbox.io/s/crimson-glade-tfix6s

When trying to update the theme with:

export const MuiAlert = {
  MuiAlert: {
    variants: [
      {
        props: { severity: "text" },
        style: {
          ...root,
          background: palette.primary.main,
          color: palette.background.default,
          "& .MuiSvgIcon-root": {
            height: 16
          }
        }
      }
    ]
  }
};

Component

  <Alert severity="text">This is an error alert — check it out!</Alert>

I get the error

Cannot read properties of undefined (reading 'type')

Normally I would expect to be able to create somewhat unstyled versions with the variants array found in MuiAlert.