zip file added during notarization


After notarizing an OSX 64-bit app using Delphi 10.3.2, there is a [projectname].zip file that appears in the same directory as [projectname], and which contains what appears to be an identical copy of the project.  Both the original deployment and the copy in the zip file seem to be codesigned and notarized, with a notarization ticket.

What is the purpose of the extra .zip file and do I need it?