support ipv4 only?

[Samueru-sama]

I recently got requested to package RiseupVPN as an AppImage here

I was able to get it to "work" but there is a problem, It doesn't work for me because it fails with this error when attemping to connect:

2026-02-11T15:13:59-04:00 WRN Error running bitmask-root: "bitmask-root: ERROR: Could not determine state of iptable chain
bitmask-root: ERROR: Could not run ['/bin/ip6tables', '--new-chain', 'bitmask']: None" error="exit status 1" cmd="/usr/sbin/bitmask-root firewall start 89.187.173.169 89.187.173.174 185.220.103.11"
2026-02-11T15:13:59-04:00 WRN Could not start VPN error="exit status 1"
qml: status off
qml: errors, setting root.error

I assume this is because I have ipv6.disable=1 in my kernel params due to an issue with my router.