This is at the very tail end of the log since its loading into a server that causes this. I can potentially provide more information if needed, however i don't see anything else in the log that is relevant.
238.039 Error ClientMultiplayerManager.cpp:1088: mod-underground-storage-tank was registered for the following nth_ticks when the map was saved but has not re-registered them as a result of loading: 1
238.039 Error ClientMultiplayerManager.cpp:99: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-underground-storage-tank"
238.040 Info ClientMultiplayerManager.cpp:608: UpdateTick(24319415) changing state from(ConnectedLoadingMap) to(Failed)
246.889 Info ClientMultiplayerManager.cpp:211: Quitting multiplayer connection.
246.892 Info ClientMultiplayerManager.cpp:608: UpdateTick(24319415) changing state from(Failed) to(Disconnected)
247.152 Info UDPSocket.cpp:233: Closing socket
247.153 Info UDPSocket.cpp:263: Socket closed
client side in factorio just reports that multiplayer event handlers aren't identical. I can still load into the save in single player. However in an effort to log the server console, with the same exact save that caused things to break on a previous troubleshooting test, it worked fine. And various tests after this it proceeded to not work.
im not seeing anything helpful in server logs though I do have them. Hopefully this is more helpful than the previous report.