TYPO3 Core

Overriding a field to be a richtext within overrideChildTca, like in the following example, does not trigger the HTML-parsing within DataHandler::checkValueForText():

'columnsOverrides' => [
    'foobar' => [
        'config' => [
            'overrideChildTca' => [
                'columns' => [
                    'text' => [
                        'config' => [
                            'enableRichtext' => true
                        ]
                    ]
                ]
            ]
        ]
    ]
]

The DataHandler only checks the config of the field itself and columnsOverrides of the same TCA, but not overrideChildTca of the TCA of the parent element.
This was found in TYPO3 v9.5.10 with php7.2, but probably also applies to other versions.