Running https://fedoraproject.org/wiki/QA:Testcase_Mediakit_FileConflicts (a test for conflicts on DVD media) comes up with this:
2 file conflicts found.
1 package conflicts found.
== Package conflicts ==
== File conflicts, listed by conflicting packages ==
I believe the issue there is that there are conflicting files between moby-engine and docker-common, but moby-engine only explicitly conflicts with docker (not docker-common). I think an explicit conflict between moby-engine and docker-common is needed instead of / in addition to the conflict between moby-engine and docker.
This is, I believe, an automatic Final blocker: "File conflicts between two packages on a release-blocking DVD-style (offline installer) image without an explicit Conflicts: tag (failures of QA:Testcase_Mediakit_FileConflicts)" - https://fedoraproject.org/wiki/QA:SOP_blocker_bug_process#Automatic_blockers
moby-engine-18.06.3-2.ce.gitd7080c1.fc30 has been submitted as an update to Fedora 30. https://bodhi.fedoraproject.org/updates/FEDORA-2019-a96ada07ed
moby-engine-18.06.3-2.ce.gitd7080c1.fc30 has been pushed to the Fedora 30 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2019-a96ada07ed
moby-engine-18.06.3-2.ce.gitd7080c1.fc30 has been pushed to the Fedora 30 stable repository. If problems still persist, please make note of it in this bug report.