Maybe about some issues. The date of Easter. The doctrine of Christ's divinity. (Although --- no, I'll take that back. If they disagreed with the doctrine of Christ's divinity, they wouldn't be ECF's. They wouldn't be Christians.) So ---
--- if you prefer, I'll state it differently --- did any Christian or any Christian Church say that Catholic communion in the Body and Blood of Christ conflicted with, or was contrary to, the NT until the 16th or 17th century?
[You say] As noted before....the ECFs are not in agreement over this issue.
Matthew, Mark, Luke, John, Paul.