[Bug Report]Edgehub - Unknown feedback message -

# Context
- Linux Ubuntu v18.04.6 LTS
- .Net-Core SDK v2.2.402
- B&R APC 2200

## Description of the issue
Warnings are issued in the EdgeHub regarding an "Unknown feedback message" from the aggregation. We receive this warning on all devices. Did not cause any problems on version 1.40, since the update to 1.41 these messages have been sent. These warnings are also sent on version 1.42.

Thanks in advance for fixing this problem.

Start by reproducing the warning in EdgeHub with the reported Ubuntu, .NET Core SDK, B&R APC 2200, and SDK versions 1.41 or 1.42, then compare behavior with 1.40. Trace the aggregation feedback-message handling to identify why the message is classified as unknown. Done means the warning no longer appears for these devices without causing regressions.

Written by the indexing model from the issue text.