**Describe the bug**
https://clickhouse-test-reports.s3.yandex.net/19702/c74631c650b42e4d107254a03bd82c2c2913039b/fuzzer_msan/server.log

Most likely introduced here: #11006
{
    if (num_rows)
    {
        checkNotFinished();
        checkEnoughSpaceInCurrentGranule(num_rows);
        offset_after_current_mark += num_rows;
        if (offset_after_current_mark == current_mark_index_granularity)
        {
            /// 
            toNextMark();
        }
    }
}
size_t MergeTreeRangeReader::Stream::finalize(Columns & columns)