I came across a weird thing today when exporting a batch of images. The cropped image was resized as if part of a full-size image, but the original (cropped) content around it was replaced with black in the resulting exported image. This was using the Fast Export (Shift-Ctrl-B) with a max width and height of 5000 px (to avoid down-sizing).
Given that I am a fresh user of RT that already has been burnt quite a few times by its alternative take on common photo editor UX, I was unsure whether this was a bug or a feature In any case, I do not want the effect, so how can I avoid it when exporting using Fast Export?