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Our data dropping problems are potentially related to apache/beam#24535 and fixed by apache/beam#25101 on 2023-01-20
That fix was released in Release-2.45.0 on Feb 15th. This updates to the latest release.
The earliest report of the bug is 2022-09-20 here
Running a full backfill job using this version here which reported 17,294,627,206 rows at the bq write stage, and saw that the corresponding table had the same number of rows.