The ExpandCSIVolumes feature appears to be enabled by default in 1.19 which suggests removing the skip in origin's rules.go during 4.6 to ensure this feature is properly tested.
Check the tests image, it includes the fix of enable "ExpandCSIVolumes" test. But looks there is no e2e test cases with this keyword. Verified with: 4.6.0-0.nightly-2020-08-26-215737
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 4.6 GA Images), 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-2020:4196