you could give someone you trust (with a smaller friends list) MR, have them invite your alt with a smaller friends list, give your alt MR, and then invite accounts from your alt
Yep, like this suggestion said. :P
But if you're doing all that it seems much simpler to just have the trusted other Manager directly invite who you want to invite. I think Norman's figured it out.
These extra hoops, though, demonstrate the sheer annoyance of this 5.08 bug. I hope it gets fixed in 5.10. The easiest quickfix seems to be to just let the Invite page load even if it can't load all your friends, so you can invite by other means. Or to not try and load all your friends at once.
Edited 3/4/2021 20:22:38