OneToOne not work

[sinadalvand]

here I'm using SQLite and I'm trying to make a one-to-one association

Box class:

@Entity
data class Box(
    @Id @GeneratedValue
    val id: Long? = null,

    @OneToOne
    @JoinColumn(name = "item_id")
    val item: Item
)

Item class:

@Entity
data class Item(
    @Id @GeneratedValue
    val id: Long? = null,
    val size: Int,

    @OneToOne(mappedBy = "item")
    val box: Box? = null,
)

but when got null for item in below code :

transaction {
       val item = ItemTable.insert(Item(size = 5))
       val box = BoxTable.insert(Box(item = item))
       val result = BoxTable.selectAll().first().toBox()
       println(result)  // problem ==> result.item = null 
   }

I tried different ways for the one-to-one association but nothing worked and I realized in generated code when it try to get Item for box it checks the existence of "ItemTable.id" instead of "BoxTable.item_id"

anyway, is this my implementation problem or library problem ?