For reference, I consider this to be a bug in LDView. That doesn't mean I have a scheduled time for it to be fixed; it just means that I consider it to be a bug in my smoothing algorithm.
Before trying to fix bugs in my algorithm, I have to decide if it's worth it, since I have also considered replacing it with a different algorithm. This other algorithm is the one I used for smoothing in my POV export. I haven't really received any feedback about whether it's better than or worse than the current algorithm (although I also haven't asked for such feedback). However, the current algorithm is useful to part authors trying to not forget conditional lines, so it will likely always remain available as an option. (The algorithm used in POV exporting uses the angle between faces, but also detects the presence of non-conditional edge lines between faces to force a crease. Properly designed parts should always have an edge line between hard-edged facets, even if the facets have a small angle between them.)
Before trying to fix bugs in my algorithm, I have to decide if it's worth it, since I have also considered replacing it with a different algorithm. This other algorithm is the one I used for smoothing in my POV export. I haven't really received any feedback about whether it's better than or worse than the current algorithm (although I also haven't asked for such feedback). However, the current algorithm is useful to part authors trying to not forget conditional lines, so it will likely always remain available as an option. (The algorithm used in POV exporting uses the angle between faces, but also detects the presence of non-conditional edge lines between faces to force a crease. Properly designed parts should always have an edge line between hard-edged facets, even if the facets have a small angle between them.)