uBit.io.logo.isTouched() doesn't work the first time after reset

[martinwork]

Arising from support ticket https://support.microbit.org/helpdesk/tickets/85223 (private)

The code below works first time if I press A (uBit.logo.isPressed) but not B (uBit.io.logo.isTouched).

After the uBit constructors, the uBit.logo TouchButton has configured the uBit.io.logo pin for it's needs but not set its IO_STATUS_TOUCH_IN flag.
https://github.com/lancaster-university/codal-core/blob/master/source/drivers/Button.cpp#L182

IO_STATUS_TOUCH_IN is only set inside isTouched, and isTouched is not called from CODAL.

The first call to uBit.io.logo.isTouched(), sees that IO_STATUS_TOUCH_IN is not set, and creates a replacement for uBit.logo.

To confirm, insert target_panic(999) before this line.
https://github.com/lancaster-university/codal-nrf52/blob/master/source/NRF52Pin.cpp#L569

#include "MicroBit.h"
MicroBit uBit;

void onButtonA(MicroBitEvent e)
{
  if ( uBit.logo.isPressed())
  {
    uBit.display.print('Y');
  }
  else
  {
    uBit.display.print('N');
  }
  uBit.sleep(100);
  uBit.display.clear();
}

void onButtonB(MicroBitEvent e)
{
  if ( uBit.io.logo.isTouched())
  {
    uBit.display.print('Y');
  }
  else
  {
    uBit.display.print('N');
  }
  uBit.sleep(100);
  uBit.display.clear();
}

void onButtonAB(MicroBitEvent e)
{
}

void forever()
{
    while (true)
    {
      uBit.sleep(1000);
    }
}


int main() {
    uBit.init();

    uBit.messageBus.listen( MICROBIT_ID_BUTTON_A,  MICROBIT_BUTTON_EVT_CLICK, onButtonA);
    uBit.messageBus.listen( MICROBIT_ID_BUTTON_B,  MICROBIT_BUTTON_EVT_CLICK, onButtonB);
    uBit.messageBus.listen( MICROBIT_ID_BUTTON_AB,  MICROBIT_BUTTON_EVT_CLICK, onButtonAB);

    create_fiber( forever);

    release_fiber();
    return 0;
}