Golang tls.Conn#Read vs net.Conn#Read discrepency

server_net.go

package main

import (
  "net"
  "log"
)

func main() {
  listener, err := net.Listen("tcp", ":8080")
  if err != nil {
    log.Fatalf("Error loading certificate: %s\n", err)
  }

  conn, err := listener.Accept()
  if err != nil {
    log.Fatalf("Error loading certificate: %s\n", err)
  }
  conn.Read(make([]byte, 0, 0))
  log.Print("Hello world\n")

}

server_tls.go

package main

import (
  "crypto/tls"
  "log"
)

func main() {
  cert, err := tls.LoadX509KeyPair("server.crt", "server.key")
  if err != nil {
    log.Fatalf("Error loading certificate: %s\n", err)
  }

  config := &tls.Config{Certificates: []tls.Certificate{cert}}

  listener, err := tls.Listen("tcp", ":8080", config)
  if err != nil {
    log.Fatalf("Error loading certificate: %s\n", err)
  }

  conn, err := listener.Accept()
  if err != nil {
    log.Fatalf("Error loading certificate: %s\n", err)
  }
  conn.Read(make([]byte, 0, 0))
  log.Print("Hello world\n")

}