Inherit Owner Bounds
Blueprint components, often times, can be set to inherit the bounds of their parent, which can cause issues if the parent has smaller bounds than the child.
The cube object below is a Blueprint composed of a Box Component (the red box in these images) and a Static Mesh Component. The Static Mesh is set to inherit its bounds from the box. If the box extents are smaller than the Static Mesh, then Out of Bounds Pixels will show those portions in various colors (blue, yellow, and white).
Since the bounding box (the blue box in these images) is always world aligned, rotating the box can bring portions of the mesh back into the bounding box. However, if any out of bounds portion of the mesh remains in the camera view, it will disappear if the bounding box moves completely off camera.
Below is a corrected Blueprint, with the Box Component's extents set correctly.