Portenta Machine Control Analog Output 2 drives 10 V when writing 0

I am seeing strange behaviour on my Portenta Machine Control unit. When I write 0 to all analog outputs, 0,1, and 3 drive 0 V, but analog output 2 drives 10 V. Analog output 2 drives 0.1 V when I write 0.1 V to it. I have duplicated the behaviour on a second identical unit.

A minimal working example is below.

  • Arduino CLI version 0.20.2
  • MBED Portenta Core version 2.6.1
  • Arduino Machine Control library version 1.0.2.
  • I have not updated the library to 1.1.0 because there have been no material changes to the AnalogOut class.
  • Uploading this for the M7 core.
#include <Arduino_MachineControl.h>

using namespace machinecontrol;

void setup()
{
    Serial.begin(9600);

    while (!Serial)
        ;
    analog_out.period_ms(0, 4);
    analog_out.period_ms(1, 4);
    analog_out.period_ms(2, 4);
    analog_out.period_ms(3, 4);

    Serial.println("Analog out test");
}


void loop()
{
    for (int i = 0; i < 4; ++i)
    {
        analog_out.write(i, 0);
    }

    delay(100);
}

Has anyone experienced the same issue? Any suggestions? Thanks in advance!