It's not a bug, it's a coughbullshitcough feature. Well known. You can faff around with filtering (and, I believe gamma correction) to take care of it. Most poser content creators usually go over the lines on a UV template to avoid it.

Almost none of us care about the Preview, since it's just a rough guide to how the finished thing will appear, although some poor souls use the preview for finished work, though why you'd want to do that is beyond me.

Coppula eam se non posit acceptera jocularum.

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