**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.
{
    auto disks = getStoragePolicy()->getDisks();
    for (const auto & disk : disks)
    {
        if (disk->exists(new_table_path))
            throw Exception{"Target path already exists: " + fullPath(disk, new_table_path), ErrorCodes::DIRECTORY_ALREADY_EXISTS};
    }
    for (const auto & disk : disks)
    {
        auto new_table_path_parent = parentPath(new_table_path);
        disk->createDirectories(new_table_path_parent);
        disk->moveDirectory(relative_data_path, new_table_path);
    }
    if (!getStorageID().hasUUID())
        getContext()->dropCaches();
    relative_data_path = new_table_path;
    renameInMemory(new_table_id);
}
void MergeTreeData::dropAllData()