Java Edition friends list can only checkJava 版好友列表仅能查看在线状态，缺失好友 P2P 联机功能

The P2P peer-to-peer multiplayer join feature was temporarily available only in the early 26.2 Snapshot 7 test build.
This multiplayer feature was removed in the later 26.2 snapshot and 26.3 snapshot.
Now the friends list only supports adding friends, checking online status and simple chat.
Even if your friend shows "In a world", there is no button to send a request to join their world at all.

Many Java players have CGNAT home networks. Their ISP blocks external ports. They cannot set up servers or join public servers easily.
We hope Mojang can polish and bring back the P2P friend join feature. Let players join friends' single-player worlds with one click, to lower the barrier for private multiplayer.                                

在 26.2 Snapshot7 测试版本曾经短暂实装 P2P 点对点联机，玩家可以在好友列表申请加入好友的单人世界。
但是后续 26.2 正式快照、26.3 快照，直接移除了这个联机功能。现在好友面板只能添加好友、查看好友在线状态、简单聊天。
哪怕好友状态显示 “正在世界游玩”，也没有任何按钮可以申请加入对方的世界。

大量 Java 玩家是 CGNAT 宽带，运营商封锁外网端口，无法自建服务器，也很难连接公共服务器。
希望 Mojang 重新完善并带回好友 P2P 一键联机功能，让好友之间可以一键进入对方单人存档，降低私人联机门槛。