That's what factorio says. From the log:
130.084 Error ClientMultiplayerManager.cpp:1106: mod-PickerBeltTools was not registered for the following events when the map was saved but has registered them as a result of loading: Custom event (ID 327)
130.084 Error ClientMultiplayerManager.cpp:1108: mod-PickerBeltTools was registered for the following events when the map was saved but has not re-registered them as a result of loading: Custom event (ID 329)
130.085 Error ClientMultiplayerManager.cpp:98: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-PickerBeltTools"