Generating unique index for HasOne relation in Cycle\MigrateCommand

[Eugentis]

I've detected some strange logic on generating index for HasOne relation.
I have 2 entities:

class Item extends AbstractEntity
{
    /**
     * @Cycle\Relation\HasOne(
     *     target="ItemInfo ",
     *     outerKey="item_id",
     *     fkAction="CASCADE"
     * )
     */
    public ItemInfo $info;
    ...
}

class ItemInfo extends AbstractEntity
{
    /**
     * @Cycle\Relation\BelongsTo(
     *     target="Item",
     *     innerKey="item_id",
     *     fkAction="CASCADE"
     * )
     */
    public Item $item;
    ...
}

I am expecting from generated migration that index will be unique but the command prepares next description:

public function up()
    {
        $this->table('item_info')
            ...
            ->addIndex(["item_id"], [
                'name'   => 'item_info_index_item_id_5e8d9e2681e26',
                'unique' => false
            ])
            ->addForeignKey(["item_id"], 'item', ["id"], [
                'name'   => 'item_info_foreign_item_id_5e8d9e2681e33',
                'delete' => 'CASCADE',
                'update' => 'CASCADE'
            ])
            ...
            ->create();
    }