[Bug] Event Hubs trigger binding missing correlation id

[MihailV1989]

Expected Behavior

Calling inputEvent.metadata["SystemProperties"]["correlation-id"] should return the correlation id as a string/bytes (inputEvent: azure.functions.EventHubEvent), see:
https://learn.microsoft.com/en-us/python/api/azure-eventhub/azure.eventhub.eventdata?view=azure-python#azure-eventhub-eventdata-system-properties

Actual Behavior

I receive an empty dict {} for the correlation-id. The whole "SystemProperties" dict looks like this:

{'message-id': {}, 'user-id': {'Length': 0, 'IsEmpty': True}, 'correlation-id': {}, 'content-type': 'application/json', 'x-opt-sequence-number-epoch': -1, 'x-opt-sequence-number': 90, 'x-opt-offset': 2479216, 'x-opt-enqueued-time': '2025-01-24T12:17:14.808+00:00', 'SequenceNumber': 90, 'Offset': 2479216, 'PartitionKey': None, 'EnqueuedTimeUtc': '2025-01-24T12:17:14.808'}

Steps to Reproduce

1. Create an Azure Function with Event Hubs trigger binding and output the "SystemProperties".
2. Sent an event that contains a correlation id using the Data Explorer or another Azure Function.

3. Check Logs

Relevant code being tried

import logging
import azure.functions as func


app = func.FunctionApp(http_auth_level=func.AuthLevel.FUNCTION)

@app.event_hub_message_trigger(
    arg_name="inputEvent",
    event_hub_name="INPUT_EVENT_HUB_NAME",
    connection="EVENTHUB",
)
def exmp_func(inputEvent: func.EventHubEvent):

    logging.info(str(inputEvent.metadata["SystemProperties"]))

Relevant log output

2025-01-24T12:17:15Z   [Information]   Receiving events for Event Hub: evh-*** (Consumer Group: '$Default', Partition Id: '3'); Operation Id: '328bb195-6a30-4981-ba5b-29dc5b65508b'.
2025-01-24T12:17:15Z   [Information]   Completed receiving events for Event Hub: evh-*** (Consumer Group: '$Default', Partition Id: '4'); Operation Id: 'c39ebbd5-d7d7-4057-a093-02dbe1b0a2a4'.  Service Retry Count: 0; Event Count: 1; Duration: '0.26' seconds
2025-01-24T12:17:15Z   [Verbose]   Started dispatching events to the processing handler for partition '4' by processor instance with identifier '853efb9d-d75e-4bf6-83f8-10977fec4d7a' for Event Hub: evh-***, Consumer Group: $Default, and Operation Id: '9bae7c31-6c23-4e0a-a34a-d82734688052'.  Event Count: '1'
2025-01-24T12:17:15Z   [Information]   Executing 'Functions.exmp_func' (Reason='(null)', Id=2c1d9b76-7996-4969-bc9f-0f75c44c87ea)
2025-01-24T12:17:15Z   [Information]   Trigger Details: PartionId: 4, Offset: 2313528, EnqueueTimeUtc: 2025-01-24T12:17:15.2790000+00:00, SequenceNumber: 83, Count: 1
2025-01-24T12:17:15Z   [Verbose]   Sending invocation id: '2c1d9b76-7996-4969-bc9f-0f75c44c87ea
2025-01-24T12:17:15Z   [Verbose]   Posting invocation id:2c1d9b76-7996-4969-bc9f-0f75c44c87ea on workerId:ddebc811-63c6-49a3-a592-67b8baa429a3
2025-01-24T12:17:15Z   [Information]   {'message-id': {}, 'user-id': {'Length': 0, 'IsEmpty': True}, 'correlation-id': {}, 'content-type': 'application/json', 'x-opt-sequence-number-epoch': -1, 'x-opt-sequence-number': 83, 'x-opt-offset': 2313528, 'x-opt-enqueued-time': '2025-01-24T12:17:15.279+00:00', 'SequenceNumber': 83, 'Offset': 2313528, 'PartitionKey': None, 'EnqueuedTimeUtc': '2025-01-24T12:17:15.279'}
2025-01-24T12:17:15Z   [Information]   Executed 'Functions.exmp_func' (Succeeded, Id=2c1d9b76-7996-4969-bc9f-0f75c44c87ea, Duration=24ms)

requirements.txt file

azure-functions~=1.20.0
pydantic==2.9.2
opentelemetry-distro~=0.48b0
azure-monitor-opentelemetry-exporter~=1.0.0b29
numpy~=1.26.2
cloudevents~=1.11.0
markdown~=3.7
elastic-apm~=6.23

Where are you facing this problem?

Production Environment (explain below)

Additional Information

The Azure Function is hosted in B2 App Service Plan, communication goes through private VNet without any public access and everything is deployed in West Europe.