This page says:

6.6. What do I do if my jigdo download gets interrupted? If your download gets interrupted, all you need to do is restart jigdo-lite and hit ENTER at all the question prompts. Jigdo-lite will pick up where it left off.

But when I re-run jigdo, it says:

The temporary directory `./debian-13.2.0-amd64-BD-1.iso.tmpdir’ already exists. Its contents ARE GOING TO BE DELETED (possibly after having been copied to the image, if they are of interest for it). If you do not want this to happen, press Ctrl-C now. Otherwise, press Return to proceed.

So which is lying, the tool or the docs?

update

I just realised it was a problem of poorly written text and sloppy reading. I mentally skipped what was in parathesis, which was important.

Strange that it would build a partial image before continuing.