On entering another scene the players active quests follow with him as intended. But on going back to previous scene, the quests for the NPCs are all reset.
We need to add a list in DataToPass gameObject that keeps track of finished quests and loads the "Finished quest conversation" for each npc that is in the list.
This can work in the same way we keep track of our opened chests
duriumm
commented
3 years ago 
On entering another scene the players active quests follow with him as intended. But on going back to previous scene, the quests for the NPCs are all reset.
We need to add a list in DataToPass gameObject that keeps track of finished quests and loads the "Finished quest conversation" for each npc that is in the list.
This can work in the same way we keep track of our opened chests