Scene change help

for example is that when an npc disappears, after switching to the next scene then switch back to the previous scene, the npc is still gone, saving will save the npc disappearance, even though you saved progress in a different scene. Any suggestions on how to make something like this?
Edit: dont show the code for saving progress

You 're going to have to explain this a lot better. And give a screen snips of the events - otherwise we’re pretty much working blind, and half guessing how to help.