你的问题核心出在下界重生点的设置上。原版Minecraft不允许将下界设置为玩家的原生重生维度（床在下界会爆炸，无法正常绑定重生点），而你的下界代码中调用了setPlayerRespawnPoint(player, Level.NETHER, sharedSpawnPosition)，这会尝试将玩家的重生点写入下界维度，违反游戏的玩家数据规则，从而触发“Invalid Player Data”错误。

对比末地代码，即便原版末地也无法用床设置重生点，但游戏对末地的重生数据存储限制更宽松；而下界的原生规则直接禁止将其设为重生维度，写入这类数据会直接导致玩家数据验证失败。

解决方案 #

1. 移除下界重生点设置代码
   直接删掉setPlayerRespawnPoint(player, Level.NETHER, sharedSpawnPosition)这一行。如果需要玩家死后回到下界，不要修改原生重生点，而是通过监听PlayerDeathEvent事件，在玩家死亡后强制传送回下界。

2. 优化传送逻辑顺序
   使用changeDimension的重载方法直接指定目标位置，避免分开调用changeDimension和teleportTo可能引发的冲突：

   public void onPlayerLoggedIn(PlayerEvent.PlayerLoggedInEvent event) {
       if (event.getEntity() instanceof ServerPlayer player && !player.level.isClientSide) {
           ServerLevel netherDimension = player.getServer().getLevel(Level.NETHER);
           if (netherDimension == null) {
               return; 
           }
           if (player.level.dimension() != Level.NETHER) {
               if (sharedSpawnPosition == null) {
                   sharedSpawnPosition = findSafeIslandPosition(netherDimension);
               }
               BlockPos spawnPos = addRandomOffset(sharedSpawnPosition);
               // 直接通过changeDimension指定传送位置
               player.changeDimension(netherDimension, new ServerPlayer.GameModeChange(player.gameMode.getGameModeForPlayer()), spawnPos.atCenter());
           }
       }
   }
   

3. 延迟执行传送逻辑
   PlayerLoggedInEvent触发时玩家数据可能尚未完全加载完成，可通过服务器延迟任务确保数据加载完毕：

   public void onPlayerLoggedIn(PlayerEvent.PlayerLoggedInEvent event) {
       if (event.getEntity() instanceof ServerPlayer player && !player.level.isClientSide) {
           player.getServer().executeLater(() -> {
               ServerLevel netherDimension = player.getServer().getLevel(Level.NETHER);
               if (netherDimension == null || player.level.dimension() == Level.NETHER) {
                   return; 
               }
               if (sharedSpawnPosition == null) {
                   sharedSpawnPosition = findSafeIslandPosition(netherDimension);
               }
               BlockPos spawnPos = addRandomOffset(sharedSpawnPosition);
               player.changeDimension(netherDimension, new ServerPlayer.GameModeChange(player.gameMode.getGameModeForPlayer()), spawnPos.atCenter());
           });
       }
   }
   

内容的提问来源于stack exchange，提问作者Gustavo Zago