They have conflicting packages:
http://artifacts.dev.testing-farm.io/22fff844-6ebc-47fe-9845-98ac27c6607c/guest-setup-b3bc2b9f-8641-4b42-8e41-f06ac694cc5b/artifact-installation-b3bc2b9f-8641-4b42-8e41-f06ac694cc5b/4-Install-packages.txt
right, the old pipeline installed the packages with --allowerasing option
https://github.com/CentOS-PaaS-SIG/upstream-fedora-pipeline/blob/master/config/Dockerfiles/fedoraci-runner/virt-customize/virt-customize.sh#L195