Media time requests

Is it forbidden to combine tunneled and regular ports going in the same direction?

I am requesting media time updates from OMX.Broadcom.clock. If I tunnel it to video_scheduler, it never fills my buffer, and ostensibly stops sending time request fulfillments to video_scheduler when reaching my requested timestamp.

I can't imagine why this would happen, but I guess it could be confused if it expects all ports to use proprietary communication.