There is syntax error in builder/test_newRepo.py, because there are used fstrings.
PR 4341
Metadata Update from @jcupova: - Custom field Size adjusted to None
Metadata Update from @tkopecek: - Issue tagged with: no_qe
Metadata Update from @tkopecek: - Issue set to the milestone: 1.35.3
Commit 33a76afa fixes this issue
Commit 6c98b602 fixes this issue
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/4340
Please continue any further discussion there.