**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.
void removePartsFromWorkingSet(const DataPartsVector & remove, bool clear_without_timeout, DataPartsLock * acquired_lock = nullptr);
    void removePartsFromWorkingSet(const DataPartsVector & remove, bool clear_without_timeout, DataPartsLock & acquired_lock);
    
    
    
    DataPartsVector removePartsInRangeFromWorkingSet(const MergeTreePartInfo & drop_range, bool clear_without_timeout,
                                                     DataPartsLock & lock);
    
    
    
    void forgetPartAndMoveToDetached(const DataPartPtr & part, const String & prefix = "", bool restore_covered = false);
    
    void tryRemovePartImmediately(DataPartPtr && part);
    
    
    DataPartsVector grabOldParts(bool force = false);
    
    void rollbackDeletingParts(const DataPartsVector & parts);
    
    void removePartsFinally(const DataPartsVector & parts);
    
    
    size_t clearOldPartsFromFilesystem(bool force = false);
    void clearPartsFromFilesystem(const DataPartsVector & parts);
    
    size_t clearOldWriteAheadLogs();