Hi,
In order to work on https://bugzilla.proxmox.com/show_bug.cgi?id=2370#c17 starting with a PVE 8.2 system I was able to rebuild proxmox-firewall program as follows:
echo "deb http://download.proxmox.com/debian/devel bookworm main" >> /etc/apt/sources.list
apt-get update
apt-get dist-upgrade...