Epic #72584: sysext:impexp
Import of localized content fails, content looses language id
Since #70825, importing localized content (static relation to language) fails due to missing handling in DataHandler for the newly introduced special TCA config "language".
The condition "$tcaFieldConf['type'] == 'select' && $tcaFieldConf['foreign_table']" in \TYPO3\CMS\Core\DataHandling\DataHandler::checkValueForGroupSelect has been true before the change and caused the given language reference to be resolved correctly.
Now this resolution step is omitted, ultimately leading to a language uid = 0 for all imported CEs records.