Overcloud update failed with 'Invalid parameter transport on Class[Nova::Migration::Libvirt]' in Red Hat OpenStack Platform

Solution In Progress - Updated -

Issue

Overcloud update failed with Invalid parameter transport on Class[Nova::Migration::Libvirt] in Red Hat OpenStack Platform.

heat resource-show <resource UUID> shows:

(...)
Wrapped exception:
Invalid parameter transport\u001b[0m
\u001b[1;31mError: Invalid parameter transport on Class[Nova::Migration::Libvirt] at /var/lib/heat-config/heat-config-puppet/f2576b84-3f6a-40a9-b724-da83b281be8a.pp:107 on node overcloud-node--8.localdomain\u001b[0m
", 
    "deploy_status_code": 1

Environment

Red Hat Enterprise Linux OpenStack Platform 7
Red Hat OpenStack Platform 8

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