My uv looks like this in SP, idk why, I have 7 texture sets, everything else baked good and this one didnt... Normals are recarculated and everything looks ok in blender & marmoset.
it causes the white edge artifacts along the uv borderit causes the white edge artifacts along the uv borders
These kind of artifacts can be due to many things, but from the picture you have sent, I would check if adding a bit more space between UV islands helps.
Also, does increasing the UV size (from 2048 to 4096 for example) remove or lower the artifacts?
Keep me posted.