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.

• 4066pr0151 Duplo Brick 1 x 2 x 2 with No Bottom Tube, Traffic Signal Double Print this part is a mold of it
• 76371 Duplo Brick 1 x 2 x 2 with Bottom Tube this part is a print of it