**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.
using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
using ManyExpressionActions = std::vector<ExpressionActionsPtr>;
class MergeTreeDeduplicationLog;
namespace ErrorCodes
{
    extern const int LOGICAL_ERROR;
}
class MergeTreeData : public IStorage, public WithMutableContext
{
public:
    
    using BrokenPartCallback = std::function<void (const String &)>;
    using DataPart = IMergeTreeDataPart;
    using MutableDataPartPtr = std::shared_ptr<DataPart>;
    using MutableDataPartsVector = std::vector<MutableDataPartPtr>;
    
    using DataPartPtr = std::shared_ptr<const DataPart>;
    using DataPartState = IMergeTreeDataPart::State;
    using DataPartStates = std::initializer_list<DataPartState>;
    using DataPartStateVector = std::vector<DataPartState>;
    using PinnedPartUUIDsPtr = std::shared_ptr<const PinnedPartUUIDs>;
    constexpr static auto FORMAT_VERSION_FILE_NAME = "format_version.txt";