```
SELECT
    CAST(([2, 1, 1023], ['', '']), 'Map(UInt8, String)') AS map,
    map[10]
```

Triggers `Assertion 'n < size()' failed` in `DB::ColumnString::operator[](unsigned long)`
https://clickhouse-test-reports.s3.yandex.net/18481/64c4ade5b0e0c9a13d6c2475431daf431fc97554/fuzzer/fuzzer.log

Introduced here: #17829
First found here: #18481
result_column = ConvertImpl<LeftDataType, RightDataType, NameCast>::execute(
                            arguments, result_type, input_rows_count, AccurateConvertStrategyAdditions());
                    }
                    else
                    {
                        result_column = ConvertImpl<LeftDataType, RightDataType, NameCast>::execute(
                            arguments, result_type, input_rows_count, AccurateOrNullConvertStrategyAdditions());
                    }
                    return true;
                }
                return false;
            });
            
            if (!res)
            {
                if (wrapper_cast_type == CastType::accurateOrNull)
                {
                    auto nullable_column_wrapper = FunctionCast::createToNullableColumnWrapper();
                    return nullable_column_wrapper(arguments, result_type, column_nullable, input_rows_count);
                }
                else
                {
                    throw Exception{"Conversion from " + std::string(getTypeName(from_type_index)) + " to " + to_type->getName() + " is not supported",
                        ErrorCodes::CANNOT_CONVERT_TYPE};
                }
            }
            return result_column;
        };
    }
    WrapperType createStringWrapper(const DataTypePtr & from_type) const