**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.
if (!version_file.first.empty())
            {
                LOG_ERROR(log, "Duplication of version file {} and {}", fullPath(version_file.second, version_file.first), current_version_file_path);
                throw Exception("Multiple format_version.txt file", ErrorCodes::CORRUPTED_DATA);
            }
            version_file = {current_version_file_path, disk};
        }
    }
    
    if (version_file.first.empty())
        version_file = {fs::path(relative_data_path) / MergeTreeData::FORMAT_VERSION_FILE_NAME, getStoragePolicy()->getAnyDisk()};
    bool version_file_exists = version_file.second->exists(version_file.first);
    
    if (!attach || !version_file_exists)
    {
        format_version = min_format_version;
        if (!version_file.second->isReadOnly())
        {
            auto buf = version_file.second->writeFile(version_file.first);
            writeIntText(format_version.toUnderType(), *buf);
            if (getContext()->getSettingsRef().fsync_metadata)
                buf->sync();
        }
    }
    else
    {
        auto buf = version_file.second->readFile(version_file.first);
        UInt32 read_format_version;
        readIntText(read_format_version, *buf);
        format_version = read_format_version;