Change outgoing TTL

When I put this this command “iptables -t mangle -I POSTROUTING 1 -j TTL --ttl-set 65” into firewall - custom rules, it doesn’t work. I ping the router and my ttl still shows as 64. I have the Beryl AX running firmware 4.5.0 beta right now, which is based on openwrt 21.02.

Any idea what I’m doing wrong?