**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.
{
    LOG_TRACE(log, "dropAllData: waiting for locks.");
    auto lock = lockParts();
    LOG_TRACE(log, "dropAllData: removing data from memory.");
    DataPartsVector all_parts(data_parts_by_info.begin(), data_parts_by_info.end());
    data_parts_indexes.clear();
    column_sizes.clear();
    
    
    if (!getStorageID().hasUUID())
        getContext()->dropCaches();
    LOG_TRACE(log, "dropAllData: removing data from filesystem.");
    
    clearPartsFromFilesystem(all_parts);
    for (const auto & disk : getDisks())
    {
        try
        {
            disk->removeRecursive(relative_data_path);
        }
        catch (const fs::filesystem_error & e)
        {
            if (e.code() == std::errc::no_such_file_or_directory)
            {
                
                tryLogCurrentException(__PRETTY_FUNCTION__);
            }
            else
                throw;