**Describe the bug**
The ClickHouse client freezes when executing `ALTER TABLE` with `ADD COLUMN` and `MODIFY ORDER` on a table built using Replicated Versioned Collapsing Merge Tree engine.

**How to reproduce**
* ClickHouse client version 20.10.1.1.
Connecting to localhost:9000 as user default.
Connected to ClickHouse server version 20.10.1 revision 54440.

* `CREATE TABLE` statements
```
SHOW CREATE TABLE table0

┌─statement──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ CREATE TABLE default.table0
(
    `d` Date,
    `a` String,
    `b` UInt8,
    `x` String,
    `y` Int8,
    `version` UInt64,
    `sign` Int8 DEFAULT 1
)
ENGINE = ReplicatedVersionedCollapsingMergeTree('/clickhouse/tables/{shard}/table0', '{replica}', sign, version)
PARTITION BY y
ORDER BY d
SETTINGS index_granularity = 8192 │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

1 rows in set. Elapsed: 0.004 sec.
```

* Queries to run that lead to unexpected result
```
ALTER TABLE table0 ADD COLUMN order UInt32, MODIFY ORDER BY (d, order)
```
{
        lock2.reset();
        dest_table_storage->waitForAllReplicasToProcessLogEntry(entry);
    }
    Coordination::Requests ops_dest;
    ops_dest.emplace_back(zkutil::makeCreateRequest(
        zookeeper_path + "/log/log-", entry_delete.toString(), zkutil::CreateMode::PersistentSequential));
    ops_dest.emplace_back(zkutil::makeSetRequest(zookeeper_path + "/log", "", -1));  
    op_results = zookeeper->multi(ops_dest);
    log_znode_path = dynamic_cast<const Coordination::CreateResponse &>(*op_results.front()).path_created;
    entry_delete.znode_name = log_znode_path.substr(log_znode_path.find_last_of('/') + 1);
    if (query_context.getSettingsRef().replication_alter_partitions_sync > 1)
    {
        lock1.reset();
        waitForAllReplicasToProcessLogEntry(entry_delete);
    }
    
    cleanLastPartNode(partition_id);
}
void StorageReplicatedMergeTree::getCommitPartOps(
    Coordination::Requests & ops,
    MutableDataPartPtr & part,
    const String & block_id_path) const
{
    const String & part_name = part->name;
    const auto storage_settings_ptr = getSettings();
    if (!block_id_path.empty())
    {
        
        ops.emplace_back(