Tone on A7 (wakeup) with P1 and deveope firmware

Firmware
1

I am reaching out to see if anyone can confirm the tone function of pin A7 (wkp) using a P1 with the Develop firmware branch?

When I use a simple code (below), the tone function pulsates as if it’s constantly starting and stopping. It should have a solid tone.

Any help will be much appreciated.

#define Buzzer A7 //Buzzer for sound notification

void setup() {
    pinMode(Buzzer, OUTPUT);    //Tone generator
    tone(Buzzer, 2150);
}

void loop(void) { 
}