Thanks for the heads-up.
It's definitely a bug, a side-effect of the implementation details of the red/green/blue BFC faces support in LDView. (Blue neutral faces aren't in the official 4.1 release, incidentally.) You're the first to report it, and I hadn't been aware of it. I'll investigate fixing it, but I think doing so will require a complete reimplementation of the feature, so I'm not sure if or when it will happen.
It's definitely a bug, a side-effect of the implementation details of the red/green/blue BFC faces support in LDView. (Blue neutral faces aren't in the official 4.1 release, incidentally.) You're the first to report it, and I hadn't been aware of it. I'll investigate fixing it, but I think doing so will require a complete reimplementation of the feature, so I'm not sure if or when it will happen.