mysql_stmt_errno() returns 0 after an error in mysql_stmt_execute()

In my program, I use the C mariadb connector and since my upgrade of MariaDB server to the 10.11.10 version I noticed this:

if (mysql_stmt_execute(stmt)) {

 int32_t err_code = mysql_stmt_errno(stmt);

  if (err_code == 0) {

    logger->info("This should not happen, but we are here...");

  }

}

I'm not sure the err_code is always 0. I know it is 0 when the statement is an INSERT and there are operations on the table like some repartitionning...

I also noticed this when I insert a row in a table that doesn't exist.