I found the issue. It was saving a MPD map without a Toybox room. The save file would discard the MPD mode as it is in an invalid state. I removed the fact that a non valid MPD would remove itself from the current game mode. It should be fixed on next build

I'm sorry but after many attempt I still could not replicate :^/ Are you sure it's not a misclick ? As for the feedback/suggestion, thanks ! I will see if I can do anything about it.