TYPO3 Core

TYPO3's TCA type field is rendered in the FormEngine along with a <typo3-formengine-updater> element that listens on changes on the linked type field.

This is a rare case: if FormEngine is programmatically rendered via an own controller and the value of the type field is hardcoded via overrideValues in the FormEngine compiler, the field itself is not rendered. However, the <typo3-formengine-updater> element is still there, leaving an "empty" field group.