**How to reproduce**
Clickhouse server 20.13.1.5273
```
CREATE TABLE default.test
(
`key` UInt32,
`ts` DateTime CODEC(DoubleDelta, LZ4),
`db_time` DateTime DEFAULT now() COMMENT 'spout-ignore' CODEC(DoubleDelta, LZ4)
)
ENGINE = MergeTree
PARTITION BY toStartOfTenMinutes(db_time)
ORDER BY (key, ts)
TTL db_time + toIntervalHour(3)
SETTINGS index_granularity = 8192, merge_with_ttl_timeout = 3600, min_rows_for_compact_part = 1000000, min_bytes_for_compact_part = 200000000, in_memory_parts_enable_wal = 0;


INSERT INTO test(key, ts) SELECT number % 1000, now() + intDiv(number,1000) FROM numbers(500);

SELECT * FROM test;
500 rows in set. Elapsed: 0.003 sec.

DETACH TABLE test;

ATTACH TABLE test;

SELECT * FROM test;

0 rows in set. Elapsed: 0.002 sec.
```

**Expected behavior**
Clickhouse would flush parts on disk.
getSettings()->merge_tree_clear_old_parts_interval_seconds))
    {
        assignee.scheduleCommonTask(ExecutableLambdaAdapter::create(
            [this, share_lock] ()
            {
                
                
                size_t cleared_count = 0;
                cleared_count += clearOldPartsFromFilesystem();
                cleared_count += clearOldWriteAheadLogs();
                cleared_count += clearOldMutations();
                cleared_count += clearEmptyParts();
                return cleared_count;
                
            }, common_assignee_trigger, getStorageID()),  false);
        scheduled = true;
    }
    return scheduled;
}
Int64 StorageMergeTree::getUpdatedDataVersion(
    const DataPartPtr & part,
    std::unique_lock<std::mutex> & ) const
{
    auto it = updated_version_by_block_range.find(std::make_pair(part->info.min_block, part->info.max_block));
    if (it != updated_version_by_block_range.end())
        return std::max(part->info.getDataVersion(), static_cast<Int64>(it->second));
    else
        return part->info.getDataVersion();
}
UInt64 StorageMergeTree::getCurrentMutationVersion(