No upgrade path available for Assisted Installer Tech Preview

Solution In Progress - Updated -

Issue

Installation of 4.6.z was done by using Assisted Installer.
After that an upgrade to 4.7.z via the openshift console.
When the upgrade finished successfully, an alarm on every node in the cluster is triggered:
"machine ocp053-xxxxxx-xxxxx-x is in phase: Failed"

Environment

Openshift Container Platform 4.6
Openshift Container Platform 4.7
Assisted Installer in Tech Preview

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