I am talking about https://community.bistudio.com/wiki/Arma_3:_Event_Handlers/addMissionEventHandler#Loaded
I have added this to a mods init.sqf:
handle1 = addMissionEventHandler ["Loaded",{systemchat "BLAH"}];
After savegame load, the systemchat entry is not displaying. The event is not triggered, code is not starting. I think, the eventhandler is 100% broken.
I have seen some people reporting it.
Eg. https://forums.bistudio.com/forums/topic/157192-missioneventhandlerloaded-never-fired/
You would make modders/missionmakers lives way easier - because survival of savegames without that eventhandler is a tricky thing.