I did some digging into the whole iptables nftables mess. My build didnt have iptables-nft installed.
It's working now.
See also: Packages: Keep iptables support when adding nftables - #2 by bluewavenet
/edit
still seeinf some odd stuff in the status ( Service Errors
nft add rule inet fw4 pbr_prerouting ip saddr @pbr_wan_4_src_ip_cfg046ff5 goto pbr_mark_0x010000 comment "laptop")
and after reloading fw4 it's (pbr) broken again