Not according to SN 12.15.
Remember... the Buddha was the source of the Dhamma.Thus, he wasn't providing second-hand commentary on something written down long ago. He was the primary source. Therefore, in order for those in attendance (and the broader Sangha at large) to be on the same page about his teachings, he'd have to be "on point", consistent and not needlessly explaining things differently. Thus, it's not "bizarre"... it's just expected from an unsurmountable teacher that they be aware of circumstances.
An argument does not become true, simply through repetition.
Someone within the tradition slandered the Buddha by claiming that he spoke their Abhidhamma. Others, knowingly or otherwise, repeated that falsehood. I trust that answers your question.
Metta,
Paul.