Yes indeed, there is also a report that only Jaʿfar ibn Muḥammad al-Firyābī transmitted. He said:

“Ishāq narrated to us; Shababa narrated to us; from al-Layth; from ʿUqayl; from Ibn Shihāb; from Anas, who said:
‘Whenever the Messenger of Allah ﷺ was on a journey and the sun had passed its zenith, he would perform ẓuhr and ʿaṣr together, then set out again.’”

This wording is objectionable, and the mistake comes from Jaʿfar (1). Muslim recorded the ḥadīth in his Ṣaḥīḥ (2) from ʿAmr al-Nāqid, through Shababa, with the wording:

“If he was travelling and intended to combine the prayers, he would delay ẓuhr until the beginning of ʿaṣr time and then pray the two together.”

Al-Ḥasan ibn Muḥammad al-Zaʿfarānī likewise reported it from Shababa, and the two of them are in agreement on this version in the two Ṣaḥīḥs (3) through the chain of ʿUqayl, from Ibn Shihāb, from Anas, whose wording is:

“If the pace of travel pressed him, he would delay ẓuhr until the first part of ʿaṣr time, then combine the two prayers.”

Given Ishāq’s stature and his outstanding power of memorisation—and since he would narrate only from memory—it is possible that he was mistaken in two reports out of seventy thousand. Even had he erred in thirty, that would never lower his rank nor hinder reliance on him. In fact, the very point that scholars examined his narrations and found no error at all except in two ḥadīths proves that he was the most accurate memoriser of his age.