Greyscale PNG incorrectly resized for Large Image card


#1

The initial image in this article page is correctly selected as the Large Image:


However, it is incorrectly scaled width-wise to about 3/4 wide, with the remaining space filled with black:


The image is actually the right width already (280px) so no resizing should have been necessary.
It is a Greyscale colour space image saved with the GIMP.