I verified https://bugzilla.redhat.com/show_bug.cgi?id=1806286 today, so it will take some time for the changes to be backported to 4.4. In 4.4.0-0.nightly-2020-03-16-124852 they are not there yet. I'll check again in a few days.
I tried with 4.4.0-0.nightly-2020-03-23-010639. The obc bucketclass selection only searches in openshift-storage namespace.
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, 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/RHBA-2020:0581