While running oc adm must-gather if there are any errors reported, they show up on the oc cli process on the terminal but are not persisted to the gathered directory. The collected "must-gather.logs" do not have the stderr messages.    

Any OpenShift version

During collection of must-gather through oc adm must-gather,

a ClusterRoleBinding is created (https://github.com/openshift/oc/blob/main/pkg/cli/admin/mustgather/mustgather.go#L1078-L1107) in between collection process while oc is active, remove the binding forcefully to induce some RBAC errors.
   

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The errors are reported on the terminal but not on the collected must-gather.logs    

The must-gather.logs file should keep the collection error messages too.    

When oc adm must-gather reports some issues there is no way for us to read the errors back from the must-gather.logs, this is an issue because that means we never what went wrong.