The lattice from CAD face doesn't match up with the CAD face shape as I expected it to.
- Lattices, CAD faces
This is because CAD faces are essentially 4-sided patches that are trimmed to a certain shape. When the CAD face is reparameterized, it uses the untrimmed surface, resulting in your lattice not matching the trimmed shape. This is a limitation with the CAD face format.
We are actively trying to improve this behavior. In the meantime, we recommend trying out different blocks to create a lattice from your part: