Hi,
please note that this issue even exists with grade objects on invisible design layers or classes. To reproduce this you can follow these steps (can't record a video):
1. Draw some simple connected lines on design layer 1. They will work as guides and could resemble for example the boundary of a hardscape in real life.
2. Trace the lines with a the grade tool on design layer 2 and set the layer to invisible.
3. With the grade tool, create a new grade on design layer 1 by snapping anywhere on a line drawn in step 1.
In the dialogue box the spot elevations will look correct at first but as soon as you try to move the point of the grade object that was snapped to the guide line in step 3, you will see that this point was connected to the invisbile grade created in step 2, also dividing that grade into two grades. This also happens when you take an existing grade and snap it on of the lines.
In conclusion, it seems like two grade networks can't exist separately in the same file if the share points in the same position.
For me, this happens in Vectorworks 2024 SP3.1 (German version) on Windows 10.
Best regards,
Daniel
