TYPO3 Core

I have this code in one of my extensions:

$GLOBALS['TCA']['tt_content']['types']['myextension_plugin'] = array(
    'showitem' => '...',
    'columnsOverrides' => array(
        'imageorient' => array(
            'config' => array(
                'items' => array(
                    1 => '__UNSET',
                    2 => '__UNSET',
                    4 => '__UNSET',
                    5 => '__UNSET',
                    6 => '__UNSET',
                    7 => '__UNSET',
                    8 => '__UNSET',
                    9 => '__UNSET',
                    10 => '__UNSET',
                ),
            ),
        ),
);

When I want to open a content element with this type, I only see this error since the upgrade to TYPO3 8.7:

#1439288036: An item in field imageorient of table tt_content is not an array as expected

I asked in slack about that and was told, the syntax changed and I should use the TCA migration check in install tool. I fixed all messages related to my extension, but the problem is still the same. And none of the messages, I fixed, was about "imageorient", "__UNSET" or "columnsOverride".

So I think, the TCA migration check should be extended, if this is missing.