For whatever reason, it doesn’t recognize that there’s a local file and then download the differences. Instead, it gives a message to that effect and then downloads the full .iso.
Am I alone in this? If I’m not alone, I’ve ‘solved’ the issue.
I resolved it with the following command:
zsync -i ~/Downloads/jammy-desktop-amd64.iso http://cdimage.ubuntu.com/lubuntu/daily-live/20220412/jammy-desktop-amd64.iso.zsync
If it’s not clear, the -i flag is specifying the seed file manually. This works perfectly, so I have a workaround. It has been like this for the past few daily builds. I’ll likely just use this/similar from here on out just to avoid the hassle.