do you notice that it stops the internal server for the singleplayer worlds. here are some lines that you should take a look: [11Oct2025 00:02:01.774] [Render thread/INFO][rgp_client/]: Reconnected Rocket client as session has become inactive.
[11Oct2025 00:02:01.810] [Server thread/INFO][net.minecraft.server.network.ServerGamePacketListenerImpl/]: ItsOutCast lost connection: Disconnected
[11Oct2025 00:02:01.810] [Server thread/INFO][net.minecraft.server.MinecraftServer/]: ItsOutCast left the game
[11Oct2025 00:02:01.845] [Server thread/INFO][net.minecraft.server.network.ServerCommonPacketListenerImpl/]: Stopping singleplayer server as player logged out
[11Oct2025 00:02:02.085] [Server thread/INFO][net.creeperhost.ftbbackups.FTBBackups/]: Shutdown Complete
[11Oct2025 00:02:02.091] [Render thread/INFO][mezz.jei.library.startup.JeiStarter/]: Stopping JEI
[11Oct2025 00:02:02.092] [Render thread/INFO][mezz.jei.library.load.PluginCaller/]: Sending Runtime Unavailable...
[11Oct2025 00:02:02.092] [Render thread/INFO][mezz.jei.neoforge.plugins.neoforge.NeoForgeGuiPlugin/]: Stopping JEI GUI