I am having this same problem.

OT[out] > [in]A4[thru] >[in]MM
(OT: master clock)

I want clock and transport thru A4, but this does not happen.

In the manual it is said (page 5): ”The MIDI THRU port duplicates the data arriving at the MIDI IN port…”

Clearly this is not working.

I have tried all kinds of settings of THRU PORT FUNCTIONALITY (page 47). It could maybe to understood to be a filtering function between IN and THRU, but the manual does not say so explicitly.

Any new wisdom on this? Bug or feature?