DiffData found "Missing target row found for key" while data is ok

Hi, After a CDM + ZDM migration run, I use CDM in DiffData (Validation) mode (ZDM is still running). It report a few `ERROR DiffJobSession: Missing target row found for key: [325081341794 %% 2025-10-16T13:34:02.492Z]` When I query origin and target of this specific key, they are the same, the writetime is the same, so it seems that everything is ok. But it seems that the data is updated at the precise moment where DiffData run (the writime is the same second than the "Missing target row" log). I don't really know how the "DiffData" works, but does it get a "batch" of data from origin, get from target, and compare ? So if any write happens at the same time, we can have discrepancies ? Thank you;