ardbitmap vertical mirror problem

ardbitmapBug.ino

#include <SPI.h>
#include <EEPROM.h>
#include <Arduboy2.h>
#include <math.h>

Arduboy2 arduboy;
#define ARDBITMAP_SBUF arduboy.getBuffer()
#include <ArdBitmap.h>
ArdBitmap<WIDTH, HEIGHT> ardbitmap;

const uint8_t PROGMEM candle_bmp[] = {
0x00, 0xfc, 0x02, 0x02, 0x02, 0x02, 0xc2, 0xda, 0xe2, 0x02, 0x02, 0x02, 0x02, 0x02, 0xfc, 0x00, 
0x00, 0x3f, 0x40, 0x48, 0x58, 0x58, 0x5f, 0x58, 0x5f, 0x58, 0x5c, 0x52, 0x4c, 0x40, 0x3f, 0x00, 
};


void setup() {
    arduboy.begin();
    arduboy.setFrameRate(10);
}

int16_t y = 0;

void loop() {
    if (!arduboy.nextFrame()) {
        return;
    }

    if (arduboy.pressed(UP_BUTTON)) {
        y -= 1;
    }

    if (arduboy.pressed(DOWN_BUTTON)) {
        y += 1;
    }

    arduboy.clear();

    ardbitmap.drawBitmap(4, y, candle_bmp, 16, 16, WHITE, 0, MIRROR_VERTICAL);
    arduboy.setCursor(40, 20);
    arduboy.print(y);

    arduboy.display();
}