Is this a server you are hosting? If so, I think you can force a reset using the command
fast_restartThe issue lies with the scripting of these three maps. Custom maps based on them will likely have the same issue.
Plutonium watches for everyone being dead and issues a notify to end the game. But that notify was introduced with Der Riese, the prior maps' scripting did not wait for it, it called the end game function directly. So Pluto's notify just goes into the void and nothing happens.
