In blender when baking with a multiresolution modifier from this highpoly: The baked normal-map on the low-poly looks like this when using "Bake from multires": These are the UV seams: I thought it had to do with UV seams first, but it's unable to bake round edges anywhere at all, anywhere on the model. I noticed that…
The main differenc i see for 3.1.2 and 3.6.9 is.. the island margins are baked a bit differently bit seem not affect the model itslef at all. Additionaly: since this was done with a subdiv level of only 3 and smooth shading and no seams at all.. Could it be that using 5 and maybe flat-shading leads and maybe too small…
It's definitely interesting for sure. Looking at it again, attempting what you describe with 3.1 leads to a result similar to what you are getting : a bake capturing the smooth profile of the normals from the multires high, but arranged according to the geometry of the low. But this happens only if "bake from multires" is…