Tried multiplayer against Bots.
Joining game #402 on frankfurt-test.
On my turn I bought the penultimate province and [it appeared] the game immediately ended.
I thought this was a huge bug, but in fact from looking at the log I see that instead what happened is that the next bot took a turn and bought the last province. The command to display the game-end page just must have come in before the command to display the bot's plays. (So, from the log, everything is completely fine.)