Unexpected syntax error

After updating from 10.3.10 to 10.3.12 I get an error on such (simplified) query:

SELECT COUNT(*)

FROM people 

LEFT JOIN `a_users` `user_create` on people.id_user_create = user_create.id 

LEFT JOIN `a_users` `user_update` on people.id_user_update = user_update.id 

10.3.10
Result: 2397

10.3.12
Result: (1064) You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1

If I just rename the table `a_users` to `b_users`, there is no error