It’s actually a feature, not a bug! 🙂
WordPress will use (actually image_get_intermediate_size() function) a image already cropped if the width or the height matches the required dimension, and the required dimenssion for image editor is 900×450, EXACTLY your defined width.
A workaround will be to adjust your custom image size to 205 x 499 (a pixel smaller is enough)
OR to make the default medium size 450 by 450 ( not required to be square ).
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