**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.
{
    std::lock_guard moving_lock(moving_parts_mutex);
    MergeTreeMovingParts parts_to_move;
    for (const auto & part : parts)
    {
        auto reservation = space->reserve(part->getBytesOnDisk());
        if (!reservation)
            throw Exception("Move is not possible. Not enough space on '" + space->getName() + "'", ErrorCodes::NOT_ENOUGH_SPACE);
        auto reserved_disk = reservation->getDisk();
        if (reserved_disk->exists(relative_data_path + part->name))
            throw Exception(
                "Move is not possible: " + fullPath(reserved_disk, relative_data_path + part->name) + " already exists",
                ErrorCodes::DIRECTORY_ALREADY_EXISTS);
        if (currently_moving_parts.count(part) || partIsAssignedToBackgroundOperation(part))
            throw Exception(
                "Cannot move part '" + part->name + "' because it's participating in background process",
                ErrorCodes::PART_IS_TEMPORARILY_LOCKED);
        parts_to_move.emplace_back(part, std::move(reservation));
    }
    return std::make_shared<CurrentlyMovingPartsTagger>(std::move(parts_to_move), *this);
}
bool MergeTreeData::moveParts(const CurrentlyMovingPartsTaggerPtr & moving_tagger)