Wire.end() function does not seem to work

[Pascal2739]

I am using the I2C outputs of an Arduino R4 minima board to make it communicate with other boards. I notice that the Wire.end() function does not seem to work. I commonly use this instruction to alternately switch the Uno R4 board to a "master" controller and a "slave" controller. Is this an error on my part?

Below is the sketch I am using for my tests.

"master" controller

/*  Test de fonctionnement du bus I2C
    Test d'envoi en controleur maitre de la carte
    uno R4.*/

#include <Wire.h>

void setup() {
  while (!Serial && millis() < 4000);
  Serial.println("Demarrage");
  Wire.begin(50);

}

void loop() {
  Wire.end();
  Wire.begin();
  Serial.println("Envoi d'un texte");
  Wire.beginTransmission(52);
  Wire.write("Test d'envoi en maitre");
  Wire.endTransmission();
  Wire.end();
  Wire.begin(50);
  /*Serial.println("Demande 6 caractères");
  Wire.requestFrom(52, 6);    // request 6 bytes from peripheral device #8
  while (Wire.available()) { // peripheral may send less than requested
    char c = Wire.read(); // receive a byte as character
    Serial.print(c);         // print the character
  }*/
  delay(10000);
}

"slave" controller

/*  Test de fonctionnement du bus I2C
    Test de réception en controleur esclave de la carte
    Arduino Nano-Every.*/

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Serial.println("Demarrage");
  Wire.begin(52);
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);

}

void loop() {
  delay(100);
}

void receiveEvent(int howMany)  {
  Serial.print("Nombre d'octets : "); Serial.println(howMany);
  while(Wire.available()) // loop through all but the last
  {
    char c = Wire.read(); // receive byte as a character
    Serial.print(c);         // print the character
  }
  Serial.println();
}

void requestEvent() {
  Wire.write("hello "); // respond with message of 6 bytes
}