Discrepancy between koji build and repository content

Hello.
Looking at 
https://koji.fedoraproject.org/koji/buildinfo?buildID=1423008 I can see
that, for instance,  samba-winbind-clients was successfully built for
every architecture, in particular x86_64 and i686.

But dnf reports that only the x86_64 package is available, and indeed,
looking inside 
https://dl.fedoraproject.org/pub/fedora/linux/updates/31/Everything/x86_6...
there is not the i686 RPM.

There is a specific reason or there is some kind of bug?

Thanks,
A.