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PDF 1.3, PDF/X-1a, PDF/X-3, EPS and PostScript printing flatten transparency with `flatten_document`, which only looked at art in the layers. An image with see-through pixels, a colorize paint, opacity or a blending mode drawn only through a pattern fill stayed in the pattern definition, so the flattener returned early and the writer drew the tile opaque and uncolorized (PDF 1.3 export failed on the transparency left). `flatten_document` now first expands pattern fills whose tile image needs flattening into their tiles, as legacy .ai save does. See-through tile pixels count only where the caller counts see-through images (PDF 1.3); EPS level 3 already masks them out. The EPS and PostScript print transparency warnings now see those tile images too.