Bishr bin Harb said: I heard Sayyiduna Ibn Umar (may Allah be pleased with them both) say: "Do you see their standing after the reciter finishes the surah? This qunut is certainly an innovation. The Messenger of Allah (peace and blessings be upon him) recited the qunut for only one month, then he abandoned it."
If the narration Bishr bin Harb reports from Sayyiduna Ibn Umar (may Allah be pleased with them both) is authentic, then it is evidence that he rejected the qunut before the bowing, not the qunut absolutely.
[A weak narrator: Bishr bin Harb al-Nadabi is da'if (weak).]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3158