Hello,

I am running openSUSE Leap 15.1 with firewalld-0.5.5-lp151.5.1.noarch


Enabling masquerading for a zone, enables masquerade both for ipv4 and ipv6.
The latter is generally not desirable and not usable. There is also no way to
change this behavior.

Moreover, this behavior is controversial to man firewalld-cmd(1):

[--permanent] [--zone=zone] --add-masquerade [--timeout=timeval]
           Enable IPv4 masquerade for zone. [...SKIPPED...]
           For IPv6 masquerading, please use the rich language.


This behavior has been fixed upstream:

https://github.com/firewalld/firewalld/commit//88e13653686e4b72b4964e41564c70ca0096e0a9