I have had a number of issues like this (sometimes the bitmap/raster layer is larger than the vector layer, sometimes smaller or just otherwise misaligned), but I have never been able to reproduce them consistently. Sometimes they haunt me for days at a time and then magically vanish. Sometimes making a new Drawing fixes it, but not always. Sometimes saving a new version of the 3D Design fixes it, but again, not always. Ive tried both clearing cache and reinstalling, but to no avail. When a given document had difficulty, I found that the issue even carried over to my coworker's machine. Usually I just have to work on something else that day and hope it magically fixes itself the next morning. As far as I can tell, some operation happens at some point where the bitmap image is scaled to the bounding box of all objects in a given view, then shaded. My best theory is that this process is somehow using an incorrect selection of components when scaling the image (adding components that are hidden, or omitting components that are plainly supposed to be visible). That said, I dont actually know how it all works under the hood, so perhaps my speculation is just nonsense.
