TYPO3 Core

The introduced TCA type file does not support any method to modify the title of the rendered inline records in the backend.
Previously it was possible to set a formattedLabel_userfunc in the TCA of the sys_file_reference table.
This method still gets called but the generated recordTitle will be ignored by the FileReferenceContainer::getRecordTitle() method.

I'd suggest to introduce a new event instead of re-implementing the userfunc functionality. This would add up the to already existing ModifyFileReferenceEnabledControlsEvent and ModifyFileReferenceControlsEvent.

Maybe something named ModifyFileReferenceLabelEvent.