fetchrequest_sessionviewmodel.swift

...
// Recuperamos el estado actual de la sesión
self.isFavorite = DataManager.shared.existsFavoriteSesssion(named: session.title)

$isFavorite
	// 1
	.dropFirst()
	// 2
	.receive(on: RunLoop.main)
	// 3
	.sink(receiveValue: { (favorited: Bool) -> Void in 
		if favorited
		{
			DataManager.shared.insertFavoriteSession(named: session.title, backdrop: session.imageURL)
		}
		else
		{
			DataManager.shared.deleteFavoriteSession(named: session.title)
		}
	})
...