Shutdown Event is skipped on bot closing.

[Dizyreal]

Checklist

• I am sure the error is coming from aiogram code
• I have searched in the issue tracker for similar bug reports, including closed ones

Operating system

Windows 11 Pro 22H2

Python version

Python 3.11.6

aiogram version

3.3.0

Expected behavior

Shutdown Event in Dispatcher should be fired, so all the registered functions should be called.

Current behavior

Shutdown Event in Dispatcher is ignored. Registered functions aren't getting called on bot closing.

Steps to reproduce

1. Used basic API templates to make the Bot.
2. Shutdown event in dispatcher is ignored in the following code.

Code example

import asyncio
import logging
from aiogram import Dispatcher, Bot, Router, types, F
from aiogram.filters.command import Command

# constants
BOT_TOKEN = "bla-bla"
OWNER_ID = "bla-bla"

# setup configs
logging.basicConfig(level=logging.INFO)

async def on_startup(bot: Bot):
    await bot.send_message(OWNER_ID, "Bot launched!")

async def on_shutdown(bot: Bot):
    await bot.send_message(OWNER_ID, "Bot closed!")
    
async def start():
    dp = Dispatcher()
    dp.shutdown.register(on_shutdown)
    dp.startup.register(on_startup)
    bot = Bot(token=BOT_TOKEN)
    
    try:
        await dp.start_polling(bot)
    finally:
        await bot.session.close()

if __name__ == "__main__":
    asyncio.run(start())

Logs

No response

Additional information

There is no logs about closing. Event is just skipped.

[Olegt0rr]

Signals are not supported by Windows, so you need to stop polling explicitly by await dp.stop_polling()

For aiogram team:
To close the issue we need to add information about this behaviour

[Dizyreal]

So there is no way to fire .shutdown event when program stops working on Windows?