**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.
{
            return version < s.version;
        }
    };
    std::shared_ptr<MergeMutateSelectedEntry> selectPartsToMerge(
        const StorageMetadataPtr & metadata_snapshot,
        bool aggressive,
        const String & partition_id,
        bool final,
        String * disable_reason,
        TableLockHolder & table_lock_holder,
        std::unique_lock<std::mutex> & lock,
        bool optimize_skip_merged_partitions = false,
        SelectPartsDecision * select_decision_out = nullptr);
    std::shared_ptr<MergeMutateSelectedEntry> selectPartsToMutate(const StorageMetadataPtr & metadata_snapshot, String * disable_reason, TableLockHolder & table_lock_holder, std::unique_lock<std::mutex> & currently_processing_in_background_mutex_lock, bool & were_some_mutations_for_some_parts_skipped);