Related upstream PR https://github.com/metal3-io/baremetal-operator/pull/949 pushed since WIP https://github.com/openshift/baremetal-operator/pull/171 was proven to work around this problem.
When that merges we'll need a downstream backport, and a corresponding CBO PR to set LIVE_ISO_FORCE_PERSISTENT_BOOT_DEVICE
I'm not yet sure if we'll also need to make that configurable via the provisioning CR though (there are some use-cases for persistently booting appliance ISO images via metal3, which may require the existing behavior).
Note that I hit the same issue on a Dell R640 machine where I managed to workaround it by setting the `Hard-disk Drive Placeholder` Boot Setting to Disabled.
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 4.9.0 bug fix and security 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-2021:3759