Fedora 28 needs to be updated with the new Japanese Era name before May 1st 2019.
I'm doing the F28 update.
Scratch build running, will check tomorrow: https://koji.fedoraproject.org/koji/taskinfo?taskID=33905381
glibc-2.27-38.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2019-4c499ec2f3
glibc-2.27-38.fc28 has been pushed to the Fedora 28 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-2019-4c499ec2f3
glibc-2.27-38.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.