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.

• 850c02 Ladder 10.3cm (collapsed) 2-Piece [Complete Assembly] this part is a sub-part of it
• 851a Ladder 10.3cm (collapsed) 3-Piece - Middle Section this part is a mold of it