This is likely due to a mismatch between iptables inside the container f28 (1.6.x which uses the traditional iptables modules) vs the iptables on the rhel8 host which uses iptables based on the nftables backend.
This is likely due to a mismatch between iptables inside the container f28 (1.6.x which uses the traditional iptables modules) vs the iptables on the rhel8 host which uses iptables based on the nftables backend.