That could be from a couple things.
A dry print, where the plate doesn't get dampened and retains ink everywhere.
During washdown, where they cleaned ink off the blanket with solvent, which smears it at first. But that usually isn't this consistent.
Or, a sheet of paper, or the surface of a sheet got stuck on the blanket, and retained ink since it's porous.
Of those, I think it's probably the last one.
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