As you can see in the image, the sketch line should be producing the "block" shape on both sides of this boss. For some reason after some changes further up in the tree, it started only producing the support on one side. These features (plus fillet and hole features) are then mirrored (feature mirror) and strangely, on the mirrored side, it works fine.
The extrude has draft and is set to "Up to Next." Any ideas what would cause this partial thin extrude? I don't think I'll be able to share the part.