Runtime error not showing when using asyncio to run discord bot

I’m developing discord bot with discord.py==2.1.0.

I use cog to write the main function that I wanna use, but I found when the whole bot is wrapped in async function and called by asyncio.run(), my terminal won’t show any error message when there is any runtime error in my cog script.

Here is the example application. I stored my bot token in environment variable.

• bot.py

import os
import discord
from discord.ext import commands
import asyncio

token = os.environ["BOT_TOKEN"]

class Bot(commands.Bot):
    def __init__(self):
        intents = discord.Intents.default()
        intents.members = True
        intents.message_content = True
        
        description = "bot example."

        super().__init__(
            command_prefix=commands.when_mentioned_or('!'), 
            intents=intents,
            description=description
        )

    async def on_ready(self):
        print(f'Logged in as {self.user} (ID: {self.user.id})')
        print('------')

bot = Bot()

async def load_extensions():
    for f in os.listdir("./cogs"):
        if f.endswith(".py"):
            await bot.load_extension("cogs." + f[:-3])

async def main():
    async with bot:
        await load_extensions()
        await bot.start(token)

asyncio.run(main())

• ./cogs/my_cog.py

from discord.ext import commands

class Test(commands.Cog):
    def __init__(self, client):
        self.client = client

    @commands.Cog.listener()
    async def on_ready(self):
        print("Ready")
    
    @commands.command()
    async def command(self, ctx):
        test_error_message()   # An runtime error example
        print("Command")

async def setup(client):
    await client.add_cog(Test(client))

• Command that I run in terminal to start the bot.

python bot.py

• When I type !command in the discord channel, there is no error message showing in the terminal, but there is no "Command" printed out so I’m sure the code stopped at the line I called test_error_message()
• I expected that it should show error message normally, but I cannot find useful reference to make it work 🙁
• There is one reason I need to use asyncio, I have a task loop to run in the bot, like the code below.

from discord.ext import tasks

@tasks.loop(seconds=10)
async def avatar_update():
    # code here

async def main():
    async with bot:
        avatar_update.start()
        await load_extensions()
        await bot.start(token)

• I would happy to know if there are some great practice to handle error in this situation.

Thanks!