PR #2490 contains commit #a910858 which wrongly assumes, that py 2.7 has already fixed this. It is there from some later py2 version (2.7.5 < x < 2.7.18). Let's revert that commit.
PR #2569
Metadata Update from @tkopecek: - Custom field Size adjusted to None
Metadata Update from @tkopecek: - Issue tagged with: bug, testing-ready
Metadata Update from @jcupova: - Issue tagged with: testing-done
Commit d0a40630 fixes this issue
Commit 2012ae64 fixes this issue
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/2568
Please continue any further discussion there.