同步完成后的记录数汇报有误

同步一张大数据量的表后（耗时40分钟左右以上），接下来几次同步的记录数汇报都出现不准确的情况。如下：耗时61s，实际同步的数据是1000条。

No source file, test, or entry point is named in the issue. Reproduce synchronization of a large table, then inspect the record-count reporting path across the subsequent syncs and compare reported counts with the actual 1,000-row result. Done means counts remain accurate after a long-running sync.

Written by the indexing model from the issue text.