Say a beat license never made it onto the record, or a feature never confirmed their share. That doesn't disappear into an email thread — it becomes a named open item with a person attached, and the release goes to hold.
While it's open, the release waits, and any money tied to it waits too — with the cause written next to it. Nobody gets paid by accident.
When it clears, it clears with a record: who acted, what changed, and when. Months later, if anyone asks what happened, a dispute is a lookup instead of an argument.