unable to set ipv6 DNS after latest firmware upgrade

ok, went back to previous version of the firmware, and surprise, surprise, same issue. BUT, when I loaded in a previously save configuration file for the router, since the settings for the IPv6 DNS were pre-entered, the setting stuck, until you tried to change it. simply going to the IPv6 page and hitting the save button without actually making any changes was enough to cause the gibberish setting to appear (see previously attached image from first post). So, it looks like the issue has been present for while, but has gone undetected by me, because I have been using a saved configuration file. Iam not interested in regressing my firmware to see at which point the issue appears. I will leave that for someone else with more time on their hands. For Netgear to leave such a blatant bug in their firmware is astonishing.