When the cluster to be created has schedulable masters, either because the user has explicitly requested it through the API or because there are no worker nodes, the assisted-service creates the manifest openshift/50-schedulable_masters.yaml. Since https://github.com/openshift/installer/pull/6247 landed in openshift-installer during 4.12, this causes a conflict with the file manifests/cluster-scheduler-02-config.yml which is generated by the installer, and this causes installation to fail.

4.12

100%

1. Create a compact cluster
2. Start installation

Failure to prepare the ignition files with the following error from openshift-installer:

failed to fetch dependency of \"Bootstrap Ignition Config\": failed to generate asset \"CVO Ignore\": multiple manifests for group config.openshift.io kind Scheduler namespace name cluster: manifests/cluster-scheduler-02-config.yml, openshift/50-schedulable_masters.yaml 

Cluster is installed.