since V13 it happens, that on a Midi track with a VSTi, while playback, Cubase just transpose notes randomly (only every few minutes and just one hit).
I can’t reproduce it in a new project - but it happened in several projects now while working. (seems like there has to be more going on in the project to trigger the issue).
New Instrument Track
Step Designer - adding notes
Chorder - add chord
Cubase 13 in Silicon Native mode on a M1 machine.