Network interfaces (of LXCs) are not deleted

[GamerBene19]

Disclaimer: Don't know if this is happening to VMs aswell.

When you remove a network interface in the code Terraform correctly shows the difference

 # module.lxcs.proxmox_lxc.tempCopy_100 will be updated in-place
  ~ resource "proxmox_lxc" "tempContainer" {
        id                   = "proxmox/lxc/100"
        # (25 unchanged attributes hidden)

      - network {
          - bridge   = "vmbr0" -> null
          - firewall = false -> null
          - hwaddr   = "B2:6A:15:63:1C:B1" -> null
          - ip       = "manual" -> null
          - mtu      = 0 -> null
          - name     = "eth1" -> null
          - rate     = 0 -> null
          - tag      = 0 -> null
          - type     = "veth" -> null
        }

        # (2 unchanged blocks hidden)
    }

Plan: 0 to add, 1 to change, 0 to destroy.

but does not actually delete that interface.

The required API call is sth like this

curl -X PUT -k -b PVEAuthCookie= -H "CSRFPreventionToken:" -d delete=net20,net21 https://192.168.1.222:8006/api2/json/nodes/node1/qemu/177/config -H 'Authorization: PVEAPIToken=root@pam!api_token=9d6824c0-a1c9-453e-8524-9ce179120c3e'

(command is taken from here)

There also is a TODO in the code for this.