SQS - receive_message() with MaxNumberOfMessages > 1 produces duplicates

[cecilbot]

Describe the bug
When calling client.receive_message() with MaxNumberOfMessages > 1, the message in the queue is duplicated in the response.

To clarify, this is not an SQS duplication issue from AWS; the duplicate count matches the value of MaxNumberOfMessages up to 5. Here is a basic example.

Please set QUEUE_URL to an SQS queue. Also, please note that I clear this queue before running the test.

import asyncio
from aiobotocore.session import get_session


QUEUE_URL = ""


async def main():
    session = get_session()
    async with session.create_client("sqs") as client:

        # Purge the queue to start clean
        print("Purging queue...")
        await client.purge_queue(QueueUrl=QUEUE_URL)
        await asyncio.sleep(3)  # Give AWS a moment to process purge

        # Confirm no messages
        attrs = await client.get_queue_attributes(
            QueueUrl=QUEUE_URL, AttributeNames=["ApproximateNumberOfMessages"]
        )
        print("Initial message count:", attrs["Attributes"]["ApproximateNumberOfMessages"])

        # Send 1 message
        print("Sending 1 message...")
        await client.send_message(QueueUrl=QUEUE_URL, MessageBody="Test message")
        await asyncio.sleep(2)  # Wait for it to be visible

        # Pull messages with MaxNumberOfMessages=2
        print("Receiving messages with MaxNumberOfMessages=2...")
        resp = await client.receive_message(
            QueueUrl=QUEUE_URL,
            MaxNumberOfMessages=4,
            WaitTimeSeconds=1,
        )

        messages = resp.get("Messages", [])
        print(f"Received {len(messages)} message(s):", [m["MessageId"] for m in messages])

        assert len(messages) == 1, "Expected to receive 1 message, but got something else!"


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

Checklist

• I have reproduced in environment where pip check passes without errors
• I have provided pip freeze results
• I have provided sample code or detailed way to reproduce
• I have tried the same code in botocore to ensure this is an aiobotocore specific issue
• I have tried similar code in aiohttp to ensure this is is an aiobotocore specific issue
• I have checked the latest and older versions of aiobotocore/aiohttp/python to see if this is a regression / injection

pip freeze results

aiobotocore==2.23.0
aiohappyeyeballs==2.6.1
aiohttp==3.12.13
aioitertools==0.12.0
aiosignal==1.4.0
attrs==25.3.0
botocore==1.38.27
frozenlist==1.7.0
idna==3.10
jmespath==1.0.1
multidict==6.6.3
propcache==0.3.2
python-dateutil==2.9.0.post0
six==1.17.0
urllib3==2.5.0
wrapt==1.17.2
yarl==1.20.1

Environment:

• Python Version: 3.13
• OS name and version: Darwin Kernel Version 24.5.0

Additional context
Add any other context about the problem here.