[steve B]

The Hartsel is a puzzling card.

Usually a transfer of any sort is faint but complete. Unless it's from something putting localized pressure on the stack of sheets. Since the white areas are just the surfaced side of the cardstock showing through, it should be more obvious there. But there it's entirely missing.

All I can think of is that it was too dry to transfer, but the green still hadn't dried fully and was able to soften it.
I think that's possible, but a huge stretch into improbable.

I'll have to think a bit to come up with something better.