I want to bake ptex painted object (wall) into a low-poly object with split vertex normals (hard edges) I am getting something like this constantly. Looks like the program have troubles in baking into split vertex normals. ( padding is on and each side have its own UV island) I think it requires a cage support to have those things sorted. At least X-normal does it just fine with the cage,
The same low poly object being imported as retopo mesh with "auto smooth groups" option on and thus having its vertex normals split also gets the normal map on corners look much better. Not the same good as it could be with a cage but much better.
So I would ask to fix/add a couple things:
a. add cage object support to "texture baking tool"
b. add an ability to keep vertex normals(smooth groups) on an object used as imported retopo object. Right now it comes all smoothed whatever it was originally.