Downloading a replaced packshot with the label now gives you the image it holds now. Until this fix, a packshot that had been downloaded with the AI label once, and whose image you then changed with Replace, could be delivered under Download with label as the previous image with the label on it, instead of the one you had put in its place.
The labelled copy is now tied to the image it was made from. The first labelled download after a replacement is prepared afresh from the new image, which takes a few seconds, and every later one reuses it.
Photos from your photo sessions keep the labelled copies they already have. A packshot's first labelled download after this update is prepared afresh once, whether or not you have replaced it.