Don't disconnect the player if the connection unexpectedly closes

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendPlaySessionHandler.java

@@ -193,7 +193,8 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
   public void disconnected() {
     serverConn.getServer().removePlayer(serverConn.getPlayer());
     if (!serverConn.isGracefulDisconnect() && !exceptionTriggered) {
-      serverConn.getPlayer().disconnect(ConnectionMessages.UNEXPECTED_DISCONNECT);
+      serverConn.getPlayer().handleConnectionException(serverConn.getServer(),
+          Disconnect.create(ConnectionMessages.UNEXPECTED_DISCONNECT), true);
     }
   }
 }