Unexpected Behavior in Decimal Type Conversion (Decimal(38,38))

Inserting a `toDecimal32(4, 5)` value into a `Decimal(38, 38)` column produces an unexpected result.

Version: 24.10.1.862
```sql
create table t (a Decimal(38,38)) engine=Memory;

insert into t values (toDecimal32(4,5));

select a from t;
```

Output:
```
0.59717633079061536536625392568231788544
```

https://fiddle.clickhouse.com/87f18fcf-98d5-46ef-8260-7f6c762f0d5f