pm2 fail to output print after sleep(10) when receveing a sigint

import signal
import time
import sys

def signal_handler(signum, frame):
    time.sleep(10)
    print('\nSignal received, Exit......')
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)

count = 0
try:
    while True:
        print(f'count: {count}')
        count += 1
        time.sleep(1)
except KeyboardInterrupt:
    print('\nProgram Exit')

When I press Ctrl + C in the terminal, the message Signal received, Exit...... appears after 10 seconds.

(ccxt) (base) ➜  zmqmsg python test_pm2_sig.py 
count: 0
count: 1
count: 2
^C
Signal received, Exit......

However, when I start the program with pm2 and stop it using pm2 stop, it does not print '\nSignal received, Exit......'.

21|pm2_sig | count: 0
21|pm2_sig | count: 1
21|pm2_sig | count: 2
21|pm2_sig | count: 3
21|pm2_sig | count: 4
21|pm2_sig | count: 5
21|pm2_sig | count: 6
21|pm2_sig | count: 7
21|pm2_sig | count: 8
21|pm2_sig | count: 9
21|pm2_sig | count: 10
21|pm2_sig | count: 11
21|pm2_sig | count: 12

I am running on Linux Ubuntu which supports sigint.

Start by reproducing the provided Python script under pm2 on Ubuntu and compare pm2 stop with terminal Ctrl-C signal handling. Done means identifying why the delayed signal-handler output is missing and documenting or correcting the behavior.