This hadith has been narrated on the authority of Zuhri with the same chain of transmitters that a person broke fast in Ramadan whereupon the Messenger of Allah ﷺ commanded him to free a slave (as an atonement), and the rest of the hadith is the same as narrated by Ibn Uyaina.
أَنَّ رَجُلاً أَفْطَرَ فِي رَمَضَانَ فَأَمَرَهُ رَسُولُ اللَّهِ ﷺ أَنْ يُكَفِّرَ بِعِتْقِ رَقَبَةٍ ثُمَّ ذَكَرَ بِمِثْلِ حَدِيثِ ابْنِ عُيَيْنَةَ