OS specified in parameters file not being deployed about openshift-container-platform HOT 2 OPEN

If you look at the nested templates used to create the VMs, the three mentioned parameters are passed in. There is a condition when osImageType=marketplace, marketplaceOsImage is used otherwise imageReference is used.

Don't check the OS version within the VM, look at resources.azure.com to determine the image used for the VM. The prep scripts perform a yum update so ultimately, the OS version should be identical regardless.

from openshift-container-platform.

I see, however, here is an example from a deployment where the following properties is defined in the parameters file:
"osImageType": {
"value": "marketplace"
},
"marketplaceOsImage": {
"value": {
"publisher": "redhat",
"offer": "rhel-byos",
"sku": "rhel-lvm76",
"version": "7.6.20190918"
}
}

The imageReference property is not defined.

In the deployed instance, when looking at the bastion VM as an example, we see the following in it's properties on https://resources.azure.com:
"storageProfile": {
"imageReference": {
"publisher": "redhat",
"offer": "rhel-byos",
"sku": "rhel-lvm76",
"version": "7.6.20190918"
},
"osDisk": {
"osType": "Linux",
"name": "ocpclustertest-infra01-osdisk",
"createOption": "FromImage",

However, when SSH' ing into the VM the output from hostnamectl indicates the OS version being 7.7:
Static hostname: ocpclustertest-bastion
Icon name: computer-vm
Chassis: vm
Machine ID: cef2ff62b1da4edb8ce8b4b26b865a2d
Boot ID: b4856b5b4b3241759baf1921095e520e
Virtualization: microsoft
Operating System: OpenShift Enterprise
CPE OS Name: cpe:/o:redhat:enterprise_linux:7.7:GA:server
Kernel: Linux 3.10.0-957.27.4.el7.x86_64
Architecture: x86-64

Could the issue be that imageReference has a default value in azuredeploy.json, hence that overrides the marketplaceOsImage specified in the parameters file?

from openshift-container-platform.