Tab: renderAnchor/renderButton no longer runs cleanly

[richardpilot]

What package(s) are you using?

• carbon-components
• carbon-components-react

Detailed description

The following PR, #6989, deprecated renderAnchor, suggesting an alternative renderButton to achieve the same result. However, the current state of the Tab component means that it is no longer possible for it to run cleanly with either prop without a warning.

Using renderAnchor produces the deprecated warning.
https://codesandbox.io/s/festive-jones-i6x5k?file=/src/index.js

Using renderButton produces an unrecognised prop warning and also doesn't work
https://codesandbox.io/s/pensive-chatterjee-9mxnm?file=/src/index.js

What did you expect to happen? What happened instead? What would you like to
see changed?

If the intention is to rename renderAnchor to renderButton then the new prop should be available to use in PropTypes.