I got this error trying to connect to a MP server ..

 893.063 Error ClientMultiplayerManager.cpp:1137: mod-Construction_Drones had the following event filters when the map was saved: on_entity_damaged (ID 97) (checksum: 2067246588)
 893.063 Error ClientMultiplayerManager.cpp:1144: mod-Construction_Drones registered the following event filters when the map was loaded: 
 893.063 Error ClientMultiplayerManager.cpp:98: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-Construction_Drones"
 893.063 Info ClientMultiplayerManager.cpp:581: UpdateTick(3036401) changing state from(ConnectedLoadingMap) to(Failed)

Thats strange, can you try restarting the server?

Same Error here, Restarting the Docker based server did fix the issue

  52.336 Checksum for script __Transport_Drones__/control.lua: 3618660249
  56.016 Error ClientMultiplayerManager.cpp:1137: mod-Construction_Drones had the following event filters when the map was saved: on_entity_damaged (ID 97) (checksum: 1116118713)
  56.016 Error ClientMultiplayerManager.cpp:1144: mod-Construction_Drones registered the following event filters when the map was loaded: 
  56.016 Error ClientMultiplayerManager.cpp:98: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "

So I needed to restart the server to update the mod from 0.4.11 to 0.5.1
Then restart again to clear the "event" issue
After the 2nd restart I was able to log into the server.