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在MemberLeaveEvent事件中getMember().getNick()返回的是用户的昵称而非群名片（应该是退群后用户不在群里所以没名片了）。 但是用户退群后，群管理员收到的退群系统消息里，显示的还是群名片，这个有办法获取到么？
Member.nameCardOrNick
