dhcp issue with KVM, LXC does not have the issue

Hello
we use pve enterprise repos all up to date.

dhcp server is isc-kea

we have fixed reservations set up at dhcp server based on mac address for some kvm's which are configured as dhcp clients in /etc/network/interfaces .
those kvms are not getting the reserved IP, instead they get an IP from the dhcp pool.

lxc does not have this issue.

I have been working on this for some hours . If anyone has a suggestion to fix or debug please send a communication .

Next I'll see if desktops...

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