If mock.bootstrap_image is set in extra, it always turn the feature on in mock config. It made sense before, but after next release of mock it will be default behaviour. So, we should extend it a bit to flip it both sides.
mock.bootstrap_image
mock's PR https://github.com/rpm-software-management/mock/pull/1101
Metadata Update from @tkopecek: - Custom field Size adjusted to None
PR #3873
Metadata Update from @tkopecek: - Issue tagged with: testing-ready
Metadata Update from @relias-redhat: - Issue tagged with: testing-done
Commit 38a966ab fixes this issue
Commit c0bc73fd relates to this ticket
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/3872
Please continue any further discussion there.