One potential gottcha is that if the Chord Track is set to automatic scales it can decide that the scale is changing multiple times during a progression - it thinks you are in G Hungarian or whatever for a bar or two. So you might on occasion see a red note ( i.e. not in the scale) because Cubase thinks you are using a different scale than you think you are using. You can either ignore these discrepancies, go with them and explore some different harmonic structures or set the scale manually. Nothing fundamentally right or wrong, just something to be aware of.
I’d be interested in what our more theory evolved members think about what is happening with auto scales.