Fusion applies transparent edge to large images

When in Fusion a hires jpeg image is selected as MediaIn a wide transparent edge is added to the MediaIn:
This transparent edge is also applied when the image is used as a texture for a sphere (for example) and therefore not covering the entire shape:
A smaller image doens't have this problem:
This transparent edge is also applied when the image is used as a texture for a sphere (for example) and therefore not covering the entire shape:
A smaller image doens't have this problem: