We don't use scenemanager to load a new scene for every room =) (we have only one scene), all our entities can be "respawnable". As exemple when children die, they never respawn. So we decide to make the pots, grass and few other things, "respawnable" because we wanted to have this functionnality like in the real Zelda.
But we didn't want to put a "farming moment" in our game, so everything has high chance to drop lot of money compared to a classic zelda. That's why you can buy ONE pot to the old man for 300 bubbies, because we know that it's easy to get lot of money in our game.
In fact if you know everything in our game, you can go to the Banondorf room without having the Hat or the Flute.
Anyway, thank you for your feedback !