PWM signal from analogWrite does not stop when pin is set to different mode

Looks the analogWrite() "pwm" signal on the nRF51 (now PWM hardware, so uses a timer instead) does not stop operation even after pinMode() and digitalWrite() has been applied to the same pin.

Simple sketch for testing:

const int analogOutPin = 9;

void setup() {
  // put your setup code here, to run once:
  
}

void loop() {
  // Increase PWM until maximun value, takes around a couple of seconds
  for (byte i = 0; i<255; i++) {
    analogWrite(analogOutPin, i);
    delay(10);
  }

  // Toggle the same pin high and low a couple of times
  delay(1000);
  pinMode(analogOutPin, OUTPUT);
  digitalWrite(analogOutPin, HIGH);
  delay(1000);
  digitalWrite(analogOutPin, LOW);
  delay(1000);
  digitalWrite(analogOutPin, HIGH);
  delay(1000);
  digitalWrite(analogOutPin, LOW);
  delay(1000);
}

Expected behaviour:

• PWM signal increasing from minimum to maximum
• Same pin signal toggled high and low a couple of times
• loop iterates

Recorded behaviour:

• PWM signal increasing from minimum to maximum
• PWM signal stays at maximum value
• loop iterates