Resolved Distribution List Addition Failure for Complex Filters

We fixed an issue on the classic (Mosaic) candidate list where adding records to a distribution list from an Advanced Search containing complex filters filters (such as those for custom objects) could appear to complete successfully but result in no records being added. This occurred because the system had not finished gathering the selected records by the time the modal was submitted. Now, the modal displays a Collecting Records indicator while your selection is gathered, and the Save button becomes available once the records are ready.