TYPO3 Core

In some of our own extensions the fields starttime and endtime with a lower value for range:

'starttime' => array(
    'exclude' => 1,
    'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:LGL.starttime',
    'config' => array(
        'type' => 'input',
        'renderType' => 'inputDateTime',
        'size' => 13,
        'eval' => 'datetime',
        'default' => 0,
        'range' => array(
            'lower' => mktime(0, 0, 0, date('m'), date('d'), date('Y'))
        ),
        'behaviour' => array(
            'allowLanguageSynchronization' => true,
        ),
    ),
),

Until TYPO3 10.4.17 when we create new records, the starttime and endtime is empty after save. Since TYPO3 10.4.18 the current date is inserted in both fields after save, allthough the fields were empty.