105.850 Error ClientMultiplayerManager.cpp:1121: mod-InfinityMode was not registered for the following events when the map was saved but has registered them as a result of loading: on_tick (ID 0)
105.851 Error ClientMultiplayerManager.cpp:101: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-InfinityMode"
105.851 Info ClientMultiplayerManager.cpp:592: UpdateTick(5003745) changing state from(ConnectedLoadingMap) to(Failed)

I can't reproduce this. Could you find a way to consistently get it to happen and let me know?

I installed just this mod on a "headless server" .. uploaded clean starting save
I then logged into the remote server and enabled a number of the features .. https://imgur.com/wnUXwIB
I then logged out
When I tried to log back in I got this error on the screen .. https://imgur.com/kYwcgYl
and a slightly different error in my "Factorio-current" logs

82.246 Error ClientMultiplayerManager.cpp:1121: mod-InfinityMode was not registered for the following events when the map was saved but has registered them as a result of loading: on_tick (ID 0)
82.246 Error ClientMultiplayerManager.cpp:101: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-InfinityMode"

I have also experienced this issue with a friend joining my game, downgrading to 4.0 resolved the issue for now

I went ahead and tweaked the logic for the "enable infinity mode" prompt. Once I release the update, could you please test and let me know if it's fixed now?

Are you still experiencing this error?