To work around this problem, just insert more points in the Generator curve. Then the generated scene will become more similar to what you have in Generator. In conclusion, you can fix the resolution with the number of points.
In the below pictures:
- picture #1: 4 points with shift to 0 will give a "diamond" curve, in the generated scene
- picture #2: 4 points with shift not to 0 will give a correct curve, in the generated scene
- picture #3: 10 points with shift to 0 will give a correct curve, in the generated scene
