I have a trick for that.
Octatrack Tips & Tricks (OT Tips) - #176 by sezare56
Midi thru is confusing. It can be confounded with the MIDI THRU output.
I’d use midi soft thru , or midi in through midi out…
Something better?
No
Yes
You can use a midi merger, OT MIDI OUT + DAW MIDI OUT > MERGER > A4 MIDI IN.