When a host is depoiyed using cloud-init there is a file created in /etc/sysconfig/network-scripts/ for network-scripts to handle. That can cause issues upon reboot if an interface has been configured with NetworkManager using nmcli or nmstate. If both network-scripts and NetworkManager are installed, and both have a configuration file in their respective places, then they will confict. os-net-config should remove any ifcfg files left by previous configuration tools once it uses the nmstate back-end to configure the network interface. This will prevent a collision.