#define LED_chan 0                             // <<<< ==== two different channels used
#define Servo_chan 2                           // 0 and 1 : don't work correctly
const int LED = 14, Servo = 13;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Demo Bug in LEDC function");
  ledcSetup ( LED_chan, 123, 12);                // <<<<< ===== swap the lines
  ledcSetup ( Servo_chan, 50, 12);              // latest setting "wins" if chan 0 and 1 are used
  ledcAttachPin ( LED, LED_chan);
  ledcAttachPin ( Servo, Servo_chan);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(250); // this speeds up the simulation
  int value0 = analogRead ( A0 );
  int value3 = analogRead ( A3 );
  ledcWrite ( LED_chan, value3);
  // 12 Bit PWM Resolution, 50Hz => T=20ms
  // PMW-value 408 => 0.1 * T = 2ms, 204 => 0.05 * T = 1ms
  int Servo_Pos = map (value0, 0, 4095, 204, 408);
  ledcWrite ( Servo_chan, Servo_Pos);
}