It works for Qubes OS 4.2 as well.
Change
/sbin/iptables -I INPUT -p tcp --dport 8082 -j ACCEPT
to
/usr/sbin/nft add rule ip qubes custom-input tcp dport 8082 accept
It works for Qubes OS 4.2 as well.
Change
/sbin/iptables -I INPUT -p tcp --dport 8082 -j ACCEPT
to
/usr/sbin/nft add rule ip qubes custom-input tcp dport 8082 accept