I can find absolutely no evidence of transubstantiation established either in the OT or NT. Why I made the comment. The closest is John 6 but that entire dialogue was a similtude.
There is absolutely nothing in John 6 suggesting any connection with the last supper.
The thing that struck me about CB’s remark was that there was no logical reason for men of the caliber of Paul or Peter to be trekking between Antioch and Jerusalem about an issue so well defined in Torah.
There had to be another reason that Yehova wanted that discussion highlighted in the word.