[CLIENT] Disconnected from Client during Pre-Game Lobby

This is a bug that's happened to me three separate times today, I'm now reporting it because I'm confident it's more than just a coincidence. The bug in question is that, when I have tried create a new rune page before I've locked in my champion or after I've locked in my champion while other players are still selecting their champions, then I create the runepage, then save it and close the runepage editor, but by this point I've already disconnected from the client and it says everyone has left the lobby but I'm still stuck staring at the latest 0 for whatever countdown was going on.

It seems like this bug is occurring just about anytime I'm trying to edit or create a runepage in the pregame lobby, and that's just how you might 'recreate' this bug, by being in a game lobby, then opening the runepage editor to try and create a runepage either before or just after you've drafted your champion while others are still drafting.