KEA behaves strange

[JamesFrisch]

I am pulling my hair out.

So KEA starts to behave strange again. Fine, had it in the past, that it would not convert a IPv6 lease to something static.
Fine. I create a interface on proxmox, which has its own new MAC, delete ens18 and set it to ens19.
Add for the new mac based a reservation for IPv4 and IPv6.

This time, not even the IPv4 is correct. It creates a new lease 101. Clicking on the lease, shows me my static reservation.
IPv6 does not even show a leased IP and the IPv6 of the host is still the same.

Despite a reboot of boht, I am unable to get the VM to get the old IPv4 10.0.57.2 again.