Active low button don't work with the library about button2 HOT 5 CLOSED

int BTN1 = 21;
int BTN2 = 22;
int BTN3 = 15;

// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(115200);
  pinMode(BTN1, INPUT_PULLUP);
  pinMode(BTN2, INPUT_PULLUP);
  pinMode(BTN3, INPUT_PULLUP);
}

// the loop routine runs over and over again forever:
void loop() {
  Serial.print(digitalRead(BTN1));
  Serial.print(digitalRead(BTN2));
  Serial.println(digitalRead(BTN3));
  delay(100);    
}

#include "Button2.h"

#define BUTTON_PIN_1  21
#define BUTTON_PIN_2  22
#define BUTTON_PIN_3  15

Button2 button_1, button_2, button_3;

void setup() {
  Serial.begin(115200);
  delay(50);
  Serial.println("\n\nMulti Handler Demo w/ 2 buttons");

  button_1.begin(BUTTON_PIN_1);
  button_1.setClickHandler(handler);
  button_1.setDoubleClickHandler(handler);

  button_2.begin(BUTTON_PIN_2);
  button_2.setClickHandler(handler);
  button_2.setDoubleClickHandler(handler);

  button_3.begin(BUTTON_PIN_3);
  button_3.setClickHandler(handler);
  button_3.setDoubleClickHandler(handler);
}

void loop() {
  button_1.loop();
  button_2.loop();
  button_3.loop();

  Serial.print( (button_1.isPressed()) ? "X" : "-");
  Serial.print( (button_2.isPressed()) ? "X" : "-");
  Serial.print( (button_3.isPressed()) ? "X" : "-");
  Serial.println();
  
  delay(200);
}

void handler(Button2& btn) {
    switch (btn.getClickType()) {
        case SINGLE_CLICK:
            Serial.print("single ");
            break;
        case DOUBLE_CLICK:
            Serial.print("double ");
            break;
    }
    Serial.print("click ");
    Serial.print("on button #");
    Serial.print((btn == button_1) ? " 1 " : " - ");
    Serial.print((btn == button_2) ? " 2 " : " - ");
    Serial.print((btn == button_3) ? " 3 " : " - ");
    Serial.println();
}

  Serial.print( (button_1.isPressed()) ? "X" : "-");
  Serial.print( (button_2.isPressed()) ? "X" : "-");
  Serial.print( (button_3.isPressed()) ? "X" : "-");
  Serial.println();
  
  delay(200);