**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.
{
        if (!data_parts_by_state_and_info.modify(data_parts_indexes.project<TagByStateAndInfo>(it), getStateModifier(state)))
            throw Exception("Can't modify " + (*it)->getNameWithState(), ErrorCodes::LOGICAL_ERROR);
    }
    void modifyPartState(const DataPartPtr & part, DataPartState state)
    {
        auto it = data_parts_by_info.find(part->info);
        if (it == data_parts_by_info.end() || (*it).get() != part.get())
            throw Exception("Part " + part->name + " doesn't exist", ErrorCodes::LOGICAL_ERROR);
        if (!data_parts_by_state_and_info.modify(data_parts_indexes.project<TagByStateAndInfo>(it), getStateModifier(state)))
            throw Exception("Can't modify " + (*it)->getNameWithState(), ErrorCodes::LOGICAL_ERROR);
    }
    
    std::mutex grab_old_parts_mutex;
    
    std::mutex clear_old_temporary_directories_mutex;
    void checkProperties(const StorageInMemoryMetadata & new_metadata, const StorageInMemoryMetadata & old_metadata, bool attach = false) const;
    void setProperties(const StorageInMemoryMetadata & new_metadata, const StorageInMemoryMetadata & old_metadata, bool attach = false);
    void checkPartitionKeyAndInitMinMax(const KeyDescription & new_partition_key);
    void checkTTLExpressions(const StorageInMemoryMetadata & new_metadata, const StorageInMemoryMetadata & old_metadata) const;
    void checkStoragePolicy(const StoragePolicyPtr & new_storage_policy) const;
    
    void calculateColumnAndSecondaryIndexSizesImpl();
    
    void addPartContributionToColumnAndSecondaryIndexSizes(const DataPartPtr & part);
    void removePartContributionToColumnAndSecondaryIndexSizes(const DataPartPtr & part);
    
    DataPartPtr getAnyPartInPartition(const String & partition_id, DataPartsLock & data_parts_lock) const;