Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General Stop quests closing when moving to a new level?

This suggests there are at least two copies of the level template in your current level, and the one you are looking at is not currently active.

If you want it to be persistent (i.e., items dropped there in the current level get transferred to the copy of the level template in other levels) and you want to have multiple instances of the level template in a single level, then
a) mark the level template instance that should be active (= have all the interactable objects in it) when the level loads as "StartingActivePersistentTemplate". If there is only one copy of a persistent level template in a level, this is never needed, because then that copy will be made active on level load (if there are multiple ones and none of them is marked like this, a random one will be active by default).
b) call the ActivatePersistentLevelTemplate call linked above when you want to make another instance of the level template in the current level active.