Abu Bakr al-Naysaburi said: The hearing of Amr bin Shu'ayb from his father Shu'ayb is established as authentic, as is the hearing of Shu'ayb from his grandfather Abdullah bin Amr.
The Shaykh said: In the Book of Hajj, in the chapter on intercourse by one in ihram, and in the Book of Sales, in the Book of Options (khiyar), there has already passed what shows that Shu'ayb heard from his grandfather Abdullah bin Amr. However, when it is said "Amr bin Shu'ayb, from his father, from his grandfather", it may be that what is meant is his grandfather Muhammad bin Abdullah bin Amr; and Muhammad bin Abdullah was not a Companion, so the report would be mursal. When the narrator says "from his grandfather Abdullah bin Amr", the difficulty is removed and the hadith becomes connected (mawsul). And Allah knows best. This hadith has also been narrated through other routes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 14875