[Python] Bot gets "Unclosed connection" when joining a voice channel for the first time

I am building a Discord bot using py-cord.
When the bot tries to join a voice channel for the very first time in a server, I immediately get the following warning in the console:

Unclosed connection
client_connection: Connection<ConnectionKey(host='c-lax09-d2cb781f.discord.media', port=443, is_ssl=True, ssl=True, proxy=None, proxy_auth=None, proxy_headers_hash=None)>


Things I have tried:

• Check if the bot have enough permission
• Calling disconnect(force=True) before connecting
• Clearing voice states on startup
• Restarting the bot and rejoining the same channel
• Joining a different channel (Different channel is work, but it will raise same exception while I try on the original channel)

Notes:

• I only want the bot to connect to the voice channel (no audio playback yet).
• Library: py-cord (latest version)
• FFmpeg and PyNaCl are installed
• The bot has Connect and Speak permissions

My current code to clear voice client while startup:

@bot.event
async def on_ready():
for vc in bot.voice_clients:
await vc.disconnect(force=True)


My current code to connect to the channel:

ctx.author.voice.channel.connect(reconnect=True, timeout=10)

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