Unit rejoins as NPC, loses all EXP/Items

I have a character who is playable for the first 4 chapters, then leaves (I uses the REMU command on them at the end of chapter 4). 10 chapters later, they show up again as a NPC unit, but when I load them onto the map, they lose all their exp and items. At least, most of the time. The strange thing is that when the chapter is loaded the first time, everything is fine, but if you reset the game, their stats reset as well. The LOAD command I use doesn’t make a difference, neither does using REJOIN ahead of time. In fact, even if I try loading them onto the map as a player unit, their stats still reset. I’m hacking FE8, but there has to be a way to make this work, since Lucius and Wallace reappear as NPC units in FE7 without issue.

When you change the unit from blue to green, they are permanently wiped from save data, and will only persist in suspend data. This means that they will work fine initially when loading the chapter, but if you save/reset in preps, they’re gone forever, and will be reloaded from scratch even if you try changing them to blue, because it’s too late for that save. If you want to do this sort of thing, you must change them from blue to green AFTER preparations.

Thank you, that helps a lot.