Network library examples work in 3.4, but broken in Processing 3.5.4/4.0a3

[KouichiMatsuda]

Description

I wrote the following simple_server.pde and simple_client.pde using "processing.net.*;" but their behaviors seem to be strange.
The simple_client.pde seems to receive "Hi" and "Yes".
Am I missing something?

// simple_server
import processing.net.*;
Server svr;

void setup() {
  svr = new Server(this, 5555); 
  size(450, 255);
}

void draw() {
  Client c = svr.available();
  if (c != null) { 
    String s = c.readString(); // 読み込む
    println(s);
    svr.write("Yes");
  }
}

// simple_client
import processing.net.*; 
Client c; 

void setup() { 
  c = new Client(this,"127.0.0.1", 5555);
  size(450, 255);
} 

void draw() {
  if (c.available() > 0){
    String s = c.readString(); 
    println(s);
  }
}

void mouseClicked() {
  c.write("Hi"); 
}

Expected Behavior

"Hi" should be displayed in the console of the simple_server and "Yes" should be in the console of the simple_client.
Processing 3.4 has this behavior but Processing 3.5 (4.0a3) doesn't.

Current Behavior

Both "Hi" and "Yes" are displayed in the console of the simple_client.

Steps to Reproduce

1. Execute the simple_server.
2. Execute the simple_client.
3. Click the simple_clinet window.

Your Environment

• Processing version: Processing 3.5.4 (4.0a3)
• Operating System and OS version: Windows 10 Pro, version 2004, build, 19041.804
• Other information: Processing 3.4 seems to behave as expected.

Possible Causes / Solutions

[knupel]

If the bug concern Processing 4, may be it's better to on it https://github.com/processing/processing4

[benfry]

@StanLepunK Not unless it's specific to 4.x. If a bug reported here gets fixed, it'll be moved to that repository, but please don't post in both repositories. It's just me managing both of them, and it just makes more work.

[Nilmohon]

I want to work in this issue please assign me and tell which things to learn