Verified with release 4.8.0-0.nightly-2022-04-06-190653 again.
Flexy install failed w/ the following error, test case passed.
04-07 09:28:32.248 [INFO] Generating manifests files.....
04-07 09:28:32.248 level=fatal msg=failed to fetch Master Machines: failed to load asset "Install Config": invalid "install-config.yaml" file: credentialsMode: Unsupported value: "Mint": supported values: "Manual", "Passthrough"
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 (OpenShift Container Platform 4.8.37 bug fix 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.