Hello,
this is usually caused by the dnf updates manager which is unable to find an upgrade solution with x86_64 packages and also because I think dnf has some issues with bi-arch support since Fedora abandoned the x86 target.

If you can post the full output of the command sudo dnf update I think we may find and indication of the root cause of the problem and fix it.

Another viable solution is disabling the x86 repositories by setting enabled = 0 in the file /etc/yum/repos.d/openmamba-rolling-i586.repo. Currently x86 repository is needed on x86_64 only if you use Wine for x86 or have other special needs and I might decide to disable it by default in future.

Thanks for your help Silvan, I join the dnf update output.

I don't need wine on my system, I will use your solution waiting your fix for dnf.

Hi,
the problem was indeed caused by a lockup of the tool which refreshes repository metadata and should be fixed now.

Thanks Silvan, when reenabling i586 repo I don't have see my initial problem again, it's fixed.