Hello Christian,
I am sorry for the delay. This thread somewhat slipped out of our attention.
We can reproduce these issues (missing notes as well as high latency) with Cubasis. I am sorry, I cannot provide you with a date when you can expect a fix at the moment.
As the previous poster wrote: The workaround, which also promises higher reliability and lower latency, would be using a cable and a MIDI interface.
Kind regards,
Frieder