So I learned N64 control deck is the console, now I need a way to keep TransferPak inside at all times, when saving AND loading a save state, or a way to re-insert the TransferPak...
Tried it, doesn't work, either before or after saving/loading.
Don't actually get why the error even happens, a save state somehow triggers either the game or the plugin to recheck the TransferPak, or it doesn't save it into the save state.