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This bug was initially created as a copy of Bug #1939975

I am copying this bug because: 
We want to backport this patch also for RHEL8 customers.


Description of problem:
Running

Version-Release number of selected component (if applicable):
dnf-4.6.0-1.fc34.noarch
libdnf-0.58.0-1.fc34.x86_64


How reproducible:
Every time

Steps to Reproduce:
1. sudo dnf offline-upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-303f6623fa download

Actual results:
Attempts to download every package from updates-testing.

Expected results:
Should only download the packages from the specified advisory (and necessary dependencies).


Additional info:

Fix PR:   https://github.com/rpm-software-management/dnf-plugins-core/pull/465
Docs PR:  https://github.com/rpm-software-management/dnf/pull/1859
Tests PR: https://github.com/rpm-software-management/ci-dnf-stack/pull/1172

Cloned into the RHEL9 bug: https://bugzilla.redhat.com/show_bug.cgi?id=2139326

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (dnf-plugins-core bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2975