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Create Gradient Mesh's To Center / To Edge highlight lightened every point towards RGB white, so a CMYK (or grey) point became display RGB. A patch with any non-CMYK corner then mixes in RGB, and the PDF writer separated those colours back to CMYK with K = 0, moving ink off the K plate. Points now lighten towards white in their own colour model (no ink for CMYK), so the mesh stays CMYK and K shrinks with the other inks. Flat meshes (highlight 0) already kept their inks.