**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.
std::map<std::pair<Int64, Int64>, UInt64> updated_version_by_block_range;
    std::atomic<bool> shutdown_called {false};
private:
    void loadMutations();
    
    
    void loadDeduplicationLog();
    /** Determines what parts should be merged and merges it.
      * If aggressive - when selects parts don't takes into account their ratio size and novelty (used for OPTIMIZE query).
      * Returns true if merge is finished successfully.
      */
    bool merge(bool aggressive, const String & partition_id, bool final, bool deduplicate, const Names & deduplicate_by_columns, String * out_disable_reason = nullptr, bool optimize_skip_merged_partitions = false);
    
    
    
    MergeTreeDataPartPtr outdatePart(const String & part_name, bool force);
    ActionLock stopMergesAndWait();
    
    
    Int64 startMutation(const MutationCommands & commands, String & mutation_file_name);
    
    void waitForMutation(Int64 version, const String & file_name);
    friend struct CurrentlyMergingPartsTagger;
    struct PartVersionWithName
    {
        Int64 version;
        String name;
        bool operator <(const PartVersionWithName & s) const