connect_work_size written in connect.cnf is false

I installed Microsoft ODBC Driver 11 for SQL Server with unixODBC2.3.0.

I am trying to insert into a connect table (SQL Server2005 table in another server) and found that connect_work_size is not set properly when written in connect.cnf.

When I write inside connect.cnf below,

connect_work_size=512M

I get the following error in /var/lib/mysql/servername.err

PlugSubAlloc: Not enough memory in Work area for request of 80 (used=67108792 free=72)

The size used+free is 64M, whcih is the default connect_work_size.
Not the size set in connect.cnf.

Although in Maria I get the following,

show variables like 'connect_work_size';

+-------------------+-----------+

| Variable_name     | Value     |

+-------------------+-----------+

| connect_work_size | 536870912 |

+-------------------+-----------+

1 row in set (0.00 sec)

When I set in Maria using the command,

set global connect_work_size=536870912;

the error changes to a correct one as below.

PlugSubAlloc: Not enough memory in Work area for request of 40 (used=536870888 free=24)