Some of the operators images(specifically ose-local-storage-diskmaker-rhel9, ose-sriov-network-device-plugin-rhel9 and vector-rhel9) are not pre-cached because they're not part of the seed images list. 

The pods using these images get started only after creating the operands(LocalVolume,SriovNetworkNodePolicy and ClusterLogging) which are not present on the seed.

lifecycle-agent.v4.16.0
4.16.0-rc.3

100%

1. Run IBU on an SNO with DU profile
2. After upgrade is complete check which images were pulled post-pivot
journalctl -l --system | grep 'Pulling image'

msg="Pulling image: registry.redhat.io/openshift4/ose-local-storage-diskmaker-rhel9@sha256:fad16180e6314cdc3a3bf5319785f651b614c881636d8fc04169c3ab003e98ad" id=b8811150-2114-4f71-aa40-17e136542aea name=/runtime.v1.ImageService/PullImage
Jun 07 11:29:59 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[14009]: time="2024-06-07 11:29:59.680472228Z" level=info msg="Pulling image: registry.redhat.io/openshift4/ose-local-storage-diskmaker-rhel9@sha256:fad16180e6314cdc3a3bf5319785f651b614c881636d8fc04169c3ab003e98ad" id=3dd1ec28-d513-48ef-b08d-ed721cc5f382 name=/runtime.v1.ImageService/PullImage
Jun 07 11:30:23 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[14009]: time="2024-06-07 11:30:23.679852841Z" level=info msg="Pulling image: registry.redhat.io/openshift4/ose-local-storage-diskmaker-rhel9@sha256:fad16180e6314cdc3a3bf5319785f651b614c881636d8fc04169c3ab003e98ad" id=1eb30fe5-b4d3-4f33-8f82-25d46b71b155 name=/runtime.v1.ImageService/PullImage
Jun 07 11:31:14 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[14009]: time="2024-06-07 11:31:14.682281576Z" level=info msg="Pulling image: registry.redhat.io/openshift4/ose-local-storage-diskmaker-rhel9@sha256:fad16180e6314cdc3a3bf5319785f651b614c881636d8fc04169c3ab003e98ad" id=eee23b94-4407-46a0-8fcd-8b67ba456145 name=/runtime.v1.ImageService/PullImage
Jun 07 11:32:18 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[29185]: time="2024-06-07 11:32:18.525805347Z" level=info msg="Pulling image: registry.redhat.io/openshift4/ose-local-storage-diskmaker-rhel9@sha256:fad16180e6314cdc3a3bf5319785f651b614c881636d8fc04169c3ab003e98ad" id=82c3c7b2-5dbc-42af-a925-3122d1e9eecd name=/runtime.v1.ImageService/PullImage
Jun 07 11:33:04 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[29185]: time="2024-06-07 11:33:04.960864616Z" level=info msg="Pulling image: registry.redhat.io/openshift-logging/vector-rhel9@sha256:b6691ffe1e58a570cbe6f5e12dec55305880935e14e84de1a361931b09b36047" id=9b172850-a175-423a-a9e1-73e019ac9247 name=/runtime.v1.ImageService/PullImage
Jun 07 11:33:05 sno.kni-qe-1.lab.eng.rdu2.redhat.com bash[29185]: time="2024-06-07 11:33:05.853651441Z" level=info msg="Pulling image: registry.redhat.io/openshift4/ose-sriov-network-device-plugin-rhel9@sha256:3db4ef91f1b6a649fa0c8d5ea1e6925444518e3d9e0d82edf8085bb65d457bd1" id=1eff22ee-9356-4344-b96d-1f766ba9e262 name=/runtime.v1.ImageService/PullImage

All images required post-pivot are pre-cached during Prep stage.