When create the HostedCluster and set the marketplace flags with image-generation flag, no error , no notice should not use the  marketplace flags and image-generation flag at the same time.    

4.21, 4.20
    

always
    

    1. ./hypershift create cluster azure     --name "$CLUSTER_NAME" \ 
   --namespace "$CLUSTER_NAMESPACE" \
   --azure-creds $AZURE_CREDS  \
   --location ${LOCATION}  \
   --node-pool-replicas 2  \
   --base-domain $PARENT_DNS_ZONE \
   --pull-secret $PULL_SECRET \
   --generate-ssh \
   --release-image ${RELEASE_IMAGE}  \
   --external-dns-domain ${DNS_ZONE_NAME} \
   --resource-group-name "${MANAGED_RG_NAME}"  \
   --vnet-id "${GetVnetID}"  \
   --subnet-id "${GetSubnetID}"  \
   --network-security-group-id "${GetNsgID}"  \
   --sa-token-issuer-private-key-path "${SA_TOKEN_ISSUER_PRIVATE_KEY_PATH}"  \
   --oidc-issuer-url "${OIDC_ISSUER_URL}" \
   --marketplace-publisher azureopenshift  \
   --marketplace-offer aro4   \
   --marketplace-sku aro_419  \
   --marketplace-version 419.6.20250523  \
   --dns-zone-rg-name ${PERSISTENT_RG_NAME}   \
   --assign-service-principal-roles  \
   --workload-identities-file ./workload-identities.json  \
   --diagnostics-storage-account-type Managed \
   --control-plane-operator-image=quay.io/zhouying7780/hypershift-control-plane:latest \
  --image-generation Gen1      

The command succeed, but only ignored the set about `--image-generation Gen1`

Should not silently ignore when set marketplace flags with image-generation flag, better to give clearly message about the usage for these flags.