EXTRA · Parashas Vayeishev · Passuk 40:23 · not a Torah Temimah citation on this passuk
Yet the chief cupbearer did not think of Joseph; he forgot him.
Classical source (EXTRA side-ring): Bereshis Rabbah 89:3.
Sefaria — Bereshis Rabbah 89:3
English: “And the chief cupbearer did not remember Yosef, and he forgot him” — he forgot him for good, so that he would come before Pharaoh.
Derash on the verse (Bereshis Rabbah) — not a formal named middah of the 13. Apparent setback is reframed as preparation.
The cupbearer’s forgetfulness delays Yosef until the moment when Pharaoh himself will need the dreamer.