Is this right point to bring this up?
Hard to say without more context, but this is likely:
https://pagure.io/fedora-infrastructure/issue/11917
and
https://pagure.io/releng/issue/12097
and others
Basically the repodata was zstd compressed, but old mergerepo_c couldn’t process it.
It’s since been changed and the current repodata should be working.