How to declare PB3 reset pin of ATtiny44 in program (using arduino IDE platform)

As follow-up of my former question:

Hi, I want to know how I can access PB3 reset pin of ATtiny44 IC. I ran out of pins so I am using it as I/O pin, but I am unable to declare it in the code.

This picture above says that PB3 is pin 11. But if I declare it as pin 11, the reset pin does not function at all.

// in setup():
    DDRB |= (uint8_t)(1U << 3);

// in loop():
    PORTB |= (uint8_t)(1U << 3);    // set PB3 to "high"
    PORTB &= ~((uint8_t)(1U << 3)); // set PB3 to "low"

This code works with only direct declaration.

In my code I just need to add pin number to the command like #define CSN 2.

EDIT

#include <avr/io.h>

const int led = 0;

#define led1 11

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(led, OUTPUT);
  
  pinMode(led1, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
    digitalWrite(led, HIGH);
    digitalWrite(led1, HIGH);

    delay(1000);                       // wait for a second

    digitalWrite(led1, LOW);

    digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);                       // wait for a second
}

This is the code that does not work (led1 is reset pin as GPIO). Even if I change the led1 declaration to PB3 of PCINT11, it still does not work.