Exported a model with an applied subsurf, and when I reimported I wanted to continue reduce the poly count again by disolving a ton of loops, but now some faces refuse to smooth unless I use another subsurf modifier. There are no double verticies, and I tried smoothing by vertex, edge, and face as well as recalculating normals, and checked "auto smooth" under the Object Data but nothing seems to work.
Looks fine in the 3D view (except for certain outer edges being black): https://i.imgur.com/23n13Ow.jpg
Rendered you can see all the polygons and it hurts: https://i.imgur.com/V4SzX2H.jpg
Is there any fix to this?