version 21.5.5.12 (official build)

I'm trying to change data type for a column that is used in the TTL expression.
It works well when the table is empty.
When the table is not empty, the mutation fails.
As a result the table ends up in an inconsistent state.

```
create table test
(
InsertionDateTime DateTime,
TTLDays Int32 DEFAULT CAST(365, 'Int32')
)
Engine=MergeTree()
order by tuple()
TTL InsertionDateTime + toIntervalDay(TTLDays);

Ok.

insert into test values (now(), 23);

Ok.

ALTER TABLE test modify column TTLDays Int16 DEFAULT CAST(365, 'Int16');

Code: 341, e.displayText() = DB::Exception: Exception happened during execution of mutation 'mutation_2.txt' with part 'all_1_1_0' reason: 'Code: 10, e.displayText() = DB::Exception: Not found column InsertionDateTime in block. There are only columns: TTLDays (version 21.5.5.12 (official build))'. This error maybe retryable or not. In case of unretryable error, mutation can be killed with KILL MUTATION query (version 21.5.5.12 (official build)) [DB Errorcode=341]

insert into test values (now(), 23);

Ok.

select table, column, type, sum(rows) rows, sum(column_bytes_on_disk) on_disk
from system.parts_columns where column like 'TTLDays'
group by database, table, column, type

table | column  | type  | rows | on_disk
------+---------+-------+------+--------
test  | TTLDays | Int32 |    1 |      86
test  | TTLDays | Int16 |    1 |      84
```
for (const auto & expr : expr_list->children)
                    indices_recalc_expr_list->children.push_back(expr->clone());
            }
        }
        
        else
        {
            bool mutate = false;
            const auto & index_cols = index.expression->getRequiredColumns();
            for (const auto & col : index_cols)
            {
                if (updated_columns.count(col))
                {
                    mutate = true;
                    break;
                }
            }
            if (mutate && indices_to_recalc.insert(index_factory.get(index)).second)
            {
                ASTPtr expr_list = index.expression_list_ast->clone();
                for (const auto & expr : expr_list->children)
                    indices_recalc_expr_list->children.push_back(expr->clone());
            }
        }
    }
    if (!indices_to_recalc.empty() && input_stream)
    {
        auto indices_recalc_syntax = TreeRewriter(context).analyze(indices_recalc_expr_list, input_stream->getHeader().getNamesAndTypesList());
        auto indices_recalc_expr = ExpressionAnalyzer(
                indices_recalc_expr_list,