The test is executing "oc cp" copying test/extended/authentication/ldap and hack directories into a container. In CI (aws-serial), the test is run from /tmp/directory where none of the directories are present. The current version of oc silently fails for non-existing directories/files. With oc rebase to 1.20 (https://github.com/openshift/oc/pull/648) a new check is added (https://github.com/kubernetes/kubernetes/pull/90333) which fails when directory/file does not exist. Causing "[sig-auth][Feature:LDAP][Serial] ldap group sync can sync groups from ldap" test to fail.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: OpenShift Container Platform 4.7.0 security, bug fix, and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2020:5633