Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 30116 Panel 14 x 14 x 2.667 Quarter Saucer [Plain] this part is a print of it
• 30116pr0001 Panel 14 x 14 x 2.667 Quarter Saucer with Left UFO Print this part is a pair of it