Display title of related record when using fields of type:inline as TCA label
If you want to use an inline field (1:1 relation) as label for your TCA table the UID of related record is shown as value, but it is expected to use the TCA label from the related table.
Reason why this is not shown:
TYPO3\CMS\Backend\Utility\BackendUtility::getProcessedValue() is used to get value that is used for the TCA label.
This one contains a switch which handles some field types differently, for example selects with foreign_table or group fields from internal_type db.
There is simply missing a case for fields of type:inline. Just handle it like value is processed for fields of type select.