**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 disk->getPath() + relative_data_path;
}
DiskPtr MergeTreeData::tryGetDiskForDetachedPart(const String & part_name) const
{
    String additional_path = "detached/";
    const auto disks = getStoragePolicy()->getDisks();
    for (const DiskPtr & disk : disks)
        if (disk->exists(relative_data_path + additional_path + part_name))
            return disk;
    return nullptr;
}
DiskPtr MergeTreeData::getDiskForDetachedPart(const String & part_name) const
{
    if (auto disk = tryGetDiskForDetachedPart(part_name))
        return disk;
    throw DB::Exception(ErrorCodes::BAD_DATA_PART_NAME, "Detached part \"{}\" not found", part_name);
}
Strings MergeTreeData::getDataPaths() const
{
    Strings res;
    auto disks = getStoragePolicy()->getDisks();
    for (const auto & disk : disks)
        res.push_back(getFullPathOnDisk(disk));
    return res;
}
MergeTreeData::MatcherFn MergeTreeData::getPartitionMatcher(const ASTPtr & partition_ast, ContextPtr local_context) const