Member lists aren't loading for large (1000+) groups

[Ataraxia Azemus]

Hi. I seem to be having a problem similar to #9428, in which groups with over a thousand users never load their member lists. This is super annoying, since it means I can't leave any of these groups, and that's just one less precious slot.

After some Googling and poking around over here, I found the linked Jira report but, unfortunately, upgrading my viewers didn't seem to do anything. Opening 1000+ member groups just gives me a blank members list, and attempting to leave the groups does nothing. Groups with <1000 members work perfectly fine. Same behaviors pre and post upgrades, so... Not sure what's going on there. Any help would be appreciated.