[Stepper] Breadcrumb like

Upgrading from 3.1.1. to 3.2.0, we now get warnings when we use a Stepper with a custom connector like this:

import { ChevronRight } from "mdi-material-ui";

// ...

<Stepper className="breadcrumb" connector={<ChevronRight />}>
  {arr.map(item => item)}
</Stepper>

The warnings we receive are:

We’ve tried multiple solutions here, none successful.

[bluepeter]

Thanks @oliviertassinari your solution fixes this issue for me.

Per @mbrookes note, I think the Stepper works nicely as Breadcrumbs.

Closing.

[mbrookes]

Could we add it to the docs as a customization example, which would close #8818?