Disabling UART on Due?

Hardware Arduino Due
19

Now, this is weird...

This code:

#define IN    17 //RX2
#define OUT   16 //TX2

void setup(){
Serial2.begin(115200);
Serial.begin(115200);
Serial2.print("123456");
delay(1000);
USART2->US_CR = US_CR_RXDIS;
USART2->US_CR = US_CR_TXDIS;
pinMode(OUT, OUTPUT);
pinMode(IN, INPUT);
delay(1000);
  digitalWrite(OUT, HIGH);
  delay(200);
  digitalWrite(OUT, LOW);
  delay(200);
  digitalWrite(OUT, HIGH);
  delay(200);
  digitalWrite(OUT, LOW);
  delay(1400);
USART2->US_CR = US_CR_TXEN;
USART2->US_CR = US_CR_RXEN;
  Serial2.print("123456");
  delay(20);
  Serial2.print("123456");
  Serial.print("Done");
}
void loop(){}

Gives the following response:

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The red square represents the first (one time) "Serial2.print("123456");".

Any clues of what might be happening here?

BR