Hi there, and sorry for maybe having not researched properly!
I seem to remember i switched on some kind of "send clock to MIDI (or maybe to DIN-5) and after doing something like that i had midi clock from Zynthian to my Boss505 working (DIN-5 connection). But then there has been some re-install, and now i do not find this option again - if it ever existed - and i have really been searching hard. My Midi-log shows nothing on DIN-5, but the midi-routerfires the SYS CLOCK continously.
Any help appreciated