Verified upgrading successfully from 4.8.15 to 4.9.1 using the 04_IPI on OSP16 & FIPS ON & OVN IPSEC profile from the original bz.
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 4.9.4 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.