https://bit.ly/3y5mXq4
原本橘裝部位頭盔、頸部、護腕、腰帶和戒指，要9.1後製造的才會有洞，現在暴雪拔拔
都給洞了。
With today’s update, all items granted legendary power by the Runecarver in
the Helm, Neck, Bracer, Belt, and Ring slots will receive a socket, whether
you’re creating a brand new item or upgrading an older one.
不過現有的應該是要升階，好比4->5，3->4之類的才會有洞跑出來，具體等明天歐美更新
就知道了。