/etc/network/interfaces not imported from template

[andreas-grimm]

When generating a new VM using 3.0.1-rc1 and a Debian 12 template, a modified /etc/network/interface file gets overwritten with the original Debian network configuration file:
The template is holding a configuration file using a static network address, eg. 192.168.0.56. So the file in the templates looks like:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens18
iface ens18 inet static
  address 192.168.0.56
  netmask 255.255.255.0
  gateway 192.168.0.1

But after the generation of the new VM, the network file is back to the Debian original:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug ens18
iface ens18 inet dhcp

Using the Proxmox GUI, the new generated VM hold the file of the template.

Workaround:
I am using rc.local to update the configuration after generation during the first start-up