**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.
UInt64 getCurrentMutationVersion(
        const DataPartPtr & part,
        std::unique_lock<std::mutex> & ) const;
    
    Int64 getUpdatedDataVersion(
        const DataPartPtr & part,
        std::unique_lock<std::mutex> & ) const;
    size_t clearOldMutations(bool truncate = false);
    std::vector<PartVersionWithName> getSortedPartVersionsWithNames(std::unique_lock<std::mutex> & ) const;
    
    void dropPartNoWaitNoThrow(const String & part_name) override;
    void dropPart(const String & part_name, bool detach, ContextPtr context) override;
    void dropPartition(const ASTPtr & partition, bool detach, ContextPtr context) override;
    void dropPartsImpl(DataPartsVector && parts_to_remove, bool detach);
    PartitionCommandsResultInfo attachPartition(const ASTPtr & partition, const StorageMetadataPtr & metadata_snapshot, bool part, ContextPtr context) override;
    void replacePartitionFrom(const StoragePtr & source_table, const ASTPtr & partition, bool replace, ContextPtr context) override;
    void movePartitionToTable(const StoragePtr & dest_table, const ASTPtr & partition, ContextPtr context) override;
    bool partIsAssignedToBackgroundOperation(const DataPartPtr & part) const override;
    
    
    
    void updateMutationEntriesErrors(FutureMergedMutatedPartPtr result_part, bool is_successful, const String & exception_message);