TCP IP socket.receive,在.Net应用程序中接收到数据,但不在Unity中

我通过TCP将数据从.NET应用程序发送到Unity,但未接收到所有字节。对于具有相同代码的简单.NET wpf应用程序,情况就是这样。为什么团结有区别?两者都基于.NET 4.7?

// Data send from .NET application: 
byte[] ba = memoryStream.ToArray();
var buffer = BitConverter.GetBytes(ba.Length);
stm.Write(buffer, 0, buffer.Length);
stm.Write(ba, 0, ba.Length);

// Data receive works in .NET but in Unity not all bytes are received
Socket s;
byte[] buffersizeinbytes = new byte[32];
TcpListener myList = new TcpListener(ipAd, 8001);
s = myList.AcceptSocket();
(...)
int k = s.Receive(buffersizeinbytes);
int size = BitConverter.ToInt32(lengthb, 0); // size of buffer
byte[] buffer = new byte[size]; 
int receivedByteCount = s.Receive(buffer);