SQL (1031): Not supported by this table type - when try sort field from table by Connect storage engine

Good day, I have installed MariaDB 10.3 on Windows OS, and on another port MySQL DB.

In MySQL I create simple database from example https://github.com/datacharmer/test_db ( load_employees.dump - only 30 row insert)

Next I use connect storage engine by next query:

create table employees (

  last_name varchar(255) )

engine=CONNECT table_type=MYSQL

connection='mysql://mysql:mysql@127.0.0.1:3306/employees/employees';

After this, I try to select data from created table, and everything nice

SELECT * FROM `connect_engine`.`employees`;

but when I try also SORT

SELECT * FROM `connect_engine`.`employees` ORDER BY `last_name` ASC;

I get error: SQL (1031): Not supported by this table type

If I created this sample database and table in MariaDB (not in external database with connect engine) everything works and sorts.
And also if I was not created a varchar *field and an *int - also everything works and sorts by connect engine...

That is, what is the problem when sorting varchar fields in connect storage engine?