Invoked ContentObjectRenderer::parseFunc without any configuration

[nhovratov]

This happens if you upgrade to TYPO3 v12 and use f:format.html in Backend Previews.
Use f:transform.html, f:sanitize.html or f:format.raw instead.

[nhovratov]

See: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72997