So at best, there are historical record discrepancies. Ancient history is full of it, hell even modern history is full of it. Hardly shocking and earth shattering.
Traditionally all historians accepted the Abbasid narrative which is normal. But in history if major contradictions arise, the history has to be rewritten. Thats whats happening with history of early Islam as well. It has to be rewritten and corrected in accordance with the evidence that is being found on ground.
And when this happens historians have to a complete investigation on all the accounts of Abbasids. When you find one lie, that taints the whole narrative and proves Abbasids to be liars so we cannot trust anything they say in their historical accounts.