Plate > Export Image used to force every well tile into a square, stretching the crop to fit whenever a well's true shape wasn't square. The plate view itself never had this problem — it already sizes each site to its real aspect ratio and letterboxes the montage inside the well.
Exports now use that same true tile shape. Wide montages export a wider, shorter image and tall montages a narrower, taller one, matching what you see on the plate page. Imagery resolution is unchanged, and square-tile plates export exactly as before. The same fix applies to the AI Assistant's plate overview image in generated reports.