Thread:VisualEditor/Feedback/Media/reply (3)

If you look here, it appears that the "square" image size defaults to the larger of height or width, and that it displays correctly despite being "too big" in one dimension.

I don't know if there is a need to specify both dimensions. It's common to specify only the width (when a particular size needs to be specified at all), but sometimes what's common is not what's most efficient.