During the installation of the NKP cluster you need to set an IP-address for the CONTROL_PLANE_ENDPOINT.
Unfortunately the rocky linux node (nkp-rocky-9.5-release-1.31.4-20250409153435.qcow2) also tries to obtain an IP-adress via DHCP on the same nic.
As a result the nic gets 2 IP-addresses in the same subnet (1 from the installer and 1 from the DHCP) and reports back to nkp with the DHCP address.
This results in a failing install of nkp cluster.