EDIT: Sounds like affecting 2 other titles as well (per Slack)
We just noticed our (unchanged) game started not letting players join multiplayer. It appears that quitting the game executable is no longer causing the server instance to be destroyed.
In addition, NEW servers aren't starting up when players matchmake (it says still waiting for new servers to start up)
I'm currently manually refreshing the server instances list & manually terminating games that have quit in order to allow players to play (but since it's no longer auto-scaling, we can only have 3 games per region)
Title: E79E
Live game build version # (unchanged since 5/29/2018): 0.12.2.3
Example lobby that did not terminate (manually terminated to capture logfile): 118B2245B0EDC683
Log line from our Unity output: "Quitting the game!" (which is immediately before a call to Application.Quit();)