Not sure about that…
As you know, and if I’m not wrong, Midi high res never worked well as output on the S6 and by that has not been implemented on the S8G. At least this is what I understood.
I may be wrong but worth asking to UDO support.
And actually, I just this post Super 6 NRPN problems - #10 by laney where it seems confirmed.
But again, check again so we are all sure.