Thumbnail Mode CustomIcons Not Skinned (Previews Issue?) Only Details View Icons

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In my MC, the File Type Setup Icons only skins the "Details" view mode icons, not the icons in the "Thumbnail List" view mode. Wish it would skin the icons in the Thumbnails View as well, though I can understand that images etc. /w an associated Preview Handler capability would mean the Previews in the Thumbnails would stop working, & only the static custom Icons would display —that would be an issue ! Anyway, is this a known bug ?