He reached the Prophet ﷺ while he was bowing, so he bowed before joining the row. When this was mentioned to the Prophet ﷺ, he said, "May Allah increase you in eagerness, but do not do it again."
حدثنا موسى بن إسماعيل قال حدثنا همام عن الأعلم وهو زياد عن الحسن
أنه انتهى إلى النبي ﷺ وهو راكع فركع قبل أن يصل إلى الصف فذكر ذلك للنبي ﷺ فقال زادك الله حرصا ولا تعد
Bukhari included the hadiths of Hasan narrated from Abu Bakra, among them, the hadith on the eclipse, the hadith "may Allah increase your eagerness, but do not do it again," the hadith "a people will not succeed who entrust their affairs to a woman," and the hadith "this son of mine is a master." Hasan is only narrated from Ahnaf from Abu Bakra.