Single node installation using bootstrap in place method fails on LPAR see below:

bootstrap installed successfully 
After bootstrap reboot, master boot failed because it didn't get the required config and it entered in to the emergency cell.
As part of SNO bring up first boot will happen on ephemeral disk. After bootstrap reboot it didn't get the required config to load the OS

Launch installation on LPAR using below install-config:
controlPlane:
  hyperthreading: Enabled
  name: master
  replicas: 1
  architecture: s390x
metadata:
  name: nvme
networking:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  machineNetwork:
  - cidr: 172.23.0.0/16
  networkType: OVNKubernetes
  serviceNetwork:
  - 172.30.0.0/16
platform:
  none: {}
bootstrapInPlace:
  installationDisk: /dev/nvme0n1    

Installation failed.

Installation should continue after bootstrap reboot.