TimeBasedPartitioner always writes records to year=1970 when timestamp.field is epoch seconds (like this 1740487898), even after Cast + TimestampConverter SMT conversion

[helin]

In Confluent GCS Sink (11.0.9), records contain date as epoch seconds (e.g., 1773516258), but with timestamp.extractor=RecordField and timestamp.field=date, partition paths still resolve to 1970; we tested SMT chains (Cast$Value to int64 and TimestampConverter$Value with unix.precision=seconds) but behavior did not change, while using __source_ts_ms works correctly and partitions to 2026.