TProxy IPv6 not sending connections

I'm trying to capture connections using tproxy, but I'm unable to receive IPv6 TCP connections. IPV4 TCP and both UDP work properly. TCP v4 and v6 are both received from the same accept call. I'm on Android 9. PORT=2080 MARK=2080 iptables -t $TABLE -A $CHAIN -p tcp -j TPROXY --on-port $PORT --tproxy-mark $MARK iptables -t $TABLE -A $CHAIN -p udp -j TPROXY --on-port $PORT --tproxy-mark $MARK ip rule add fwmark $MARK lookup 100 ip route add local default dev lo table 100 ip6tables -t $TABLE -A $CHAIN -j LOG --log-prefix='[iptables] ' ip6tables -t $TABLE -A $CHAIN -p tcp -j TPROXY --on-port $PORT --tproxy-mark $MARK ip6tables -t $TABLE -A $CHAIN -p udp -j TPROXY --on-port $PORT --tproxy-mark $MARK ip -6 rule add fwmark $MARK lookup 100 ip -6 route add local default dev lo table 100 The log output shows ICMP packets and TCP packets with IPv6 and IPv4 addresses, but only IPv4 gets accepted on the listener. Occasionally something connects from WSL on my laptop, but nothing else connects over ipv6 and browser tests such as https://ipv6-test.com/ say ipv6 failed. Running the command curl google.com in WSL hangs until I press ctrl+c, at which point the accept call returns the now useless socket.