I selected an area to extend an existing image, but Firefly generated nothing (got the progress bar but no layer created). Same on repeat.

Trying to expand an image of a piano keyboard, so selected the empty area to fill and clicked Generate without a prompt so it would use the image as a basis, The progress bar popped up and moved along and then nothing - no error, no fill, no change. I checked that the image layer was selected and repeated but same (non-) outcome.