Problem with TCA columns with foreign table after migrating from LTS 7 to LTS 8

Question

I'm working in a old extension.

After migrating from LTS 7, I have "invalid values (1)" in each of my TCA select types, but the correct value is checked in the list.

All upgrade wizards are OK and Database compare too.

I am using a TCA column with foreign table like this:

$GLOBALS['TCA']['tx_myextension_model'] = array(
    'columns' => array(
        'diploma_type' => array(
            'exclude' => 1,
            'config' => array(
                'type' => 'select',
                'renderType' => 'selectSingle',
                'MM' => 'sys_category_record_mm',
                'MM_match_fields' => array(
                    'fieldname' => 'diploma_type',
                    'tablenames' => 'tx_extension_name',
                ),
                'MM_opposite_field' => 'items',
                'foreign_table' => 'sys_category',
                'foreign_table_where' => ' AND (sys_category.sys_language_uid = 0 OR sys_category.l10n_parent = 0) AND pid = 35 ORDER BY title',
                'size' => 10,
                'autoSizeMax' => 20,
                'minitems' => 0,
                'maxitems' => 20,
                'behaviour' => array(
                    'allowLanguageSynchronization' => true,
                )
            )
        )
    )
);

In the table tx_myextension_model.diploma_type TYPO3 save the value 1 and in sys_category_record_mm the correct value.

Any thoughts?