Having the issue right now and there are messages flowing into EdgeHub and subsequently IoT Hub. There are zero errors showing right now in the docker container and there are no messages processing right now.
The status of the streaming job right now is now Processing. This streaming job is well within the limitations of set out within the documentation.
The only way that I know of how to fix this is to execute sys.sp_stop_streaming_job and then sys.sp_start_streaming_job.
Thanks
Phil