When verifying OCPBUGS-38869 or in 4.18, the MOSB is still in updating state even though build pod is successfully removed and seeing error in machine-os build pod

    1.Apply any MOSC  
    2.see build pod is successful
    3.But MOSB is still in updating state   
    4.And can see error in machine-os build pod
 

oc create -f - << EOF
apiVersion: machineconfiguration.openshift.io/v1alpha1
kind: MachineOSConfig
metadata:
  name: abc   
spec:
  machineConfigPool:
    name: worker
  buildOutputs:
    currentImagePullSecret:
      name: $(oc get -n openshift-machine-config-operator sa default -ojsonpath='{.secrets[0].name}')
  buildInputs:
    imageBuilder:
      imageBuilderType: PodImageBuilder
    baseImagePullSecret:
      name: $(oc get secret -n openshift-config pull-secret -o json | jq "del(.metadata.namespace, .metadata.creationTimestamp, .metadata.resourceVersion, .metadata.uid, .metadata.name)" | jq '.metadata.name="pull-copy"' | oc -n openshift-machine-config-operator create -f - &> /dev/null; echo -n "pull-copy")
    renderedImagePushSecret:
      name: $(oc get -n openshift-machine-config-operator sa builder -ojsonpath='{.secrets[0].name}')
    renderedImagePushspec: "image-registry.openshift-image-registry.svc:5000/openshift-machine-config-operator/ocb-image:latest"
    containerFile:
    - containerfileArch: noarch
      content: |-
        # Pull the centos base image and enable the EPEL repository.
        FROM quay.io/centos/centos:stream9 AS centos
        RUN dnf install -y epel-release        # Pull an image containing the yq utility.
        FROM docker.io/mikefarah/yq:latest AS yq        # Build the final OS image for this MachineConfigPool.
        FROM configs AS final        # Copy the EPEL configs into the final image.
        COPY --from=yq /usr/bin/yq /usr/bin/yq
        COPY --from=centos /etc/yum.repos.d /etc/yum.repos.d
        COPY --from=centos /etc/pki/rpm-gpg/RPM-GPG-KEY-* /etc/pki/rpm-gpg/        # Install cowsay and ripgrep from the EPEL repository into the final image,
        # along with a custom cow file.
        RUN sed -i 's/\$stream/9-stream/g' /etc/yum.repos.d/centos*.repo && \
            rpm-ostree install cowsay ripgrep
EOF
 

$ oc get machineosconfig
NAME   AGE
abc    45m

$  oc logs build-rendered-worker-c67571b26a7e0d94dc2bf01dca97bbe5 -f
  ...
Copying blob sha256:a8157ed01dfc7fe15c8f2a86a3a5e30f7fcb7f3e50f8626b32425aaf821ae23d
Copying config sha256:4b15e94c47f72b6c082272cf1547fdd074bd3539b327305285d46926f295a71b
Writing manifest to image destination
+ return 0 

$  oc get machineosbuild
NAME                                                              PREPARED   BUILDING   SUCCEEDED   INTERRUPTED   FAILED
worker-rendered-worker-c67571b26a7e0d94dc2bf01dca97bbe5-builder   False      True       False       False         False

$  oc logs machine-os-builder-654fc664bb-qvjkn  | grep -i error
I1003 16:12:52.463155       1 pod_build_controller.go:296] Error syncing pod openshift-machine-config-operator/build-rendered-worker-c67571b26a7e0d94dc2bf01dca97bbe5: unable to update with build pod status: could not update MachineOSConfig"abc": MachineOSConfig.machineconfiguration.openshift.io "abc" is invalid: [observedGeneration: Required value, <nil>: Invalid value: "null": some validation rules were not checked because the object was invalid; correct the existing errors to complete validation]

MOSB should be successful