Bug #92372 Error code: 1290 MySQL server running with --secure-file-priv option

Description:
I'm just trying to run 

LOAD DATA INFILE 'D:\TPCH\customer.tbl' 
INTO TABLE customer
FIELDS TERMINATED BY '|'
LINES TERMINATED BY '\n';

and getting error message.

The error message says Error Code 1290:that MySQL server running with secure-file-priv option but I've tried disabling secure-file-priv option from Server -> Option File -> Security Tab -> Unchecking the secure file priv option and restarting the server. 
I even tried making this changes and reboot the system but somehow the error persists. I've checked my.ini config file to verify that the --secure-file-priv is commented out when I unchecked it from GUI. Still the error persists.

I even went ahead to see the system variables and check the value of --secure-file-priv only to witness that it is NULL. No matter what value --secure-file-priv has, or even it is disabled. The error code says the server is running with --secure-file-priv option.

The other commands like SELECT, are working file except for LOAD DATA INFILE

How to repeat:
Install MySQL Server, Workbench, Router, Shell all of v8.0.12.
Try running LOAD DATA INFILE commmand from the workbench and the error should be displayed.

We're sorry, but the bug system is not the appropriate forum for asking help on using MySQL products. 

Please ref https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html#sysvar_secure_file_pr...
- strict secure_file_priv

mysql> select @@secure_file_priv;
+--------------------+
| @@secure_file_priv |
+--------------------+
| NULL               |
+--------------------+
1 row in set (0.00 sec)

LOAD DATA INFILE 'D:\\MySQL\\fdef.txt' INTO TABLE test.datetimetest
  FIELDS TERMINATED BY '\t'
  LINES TERMINATED BY '\n';

WB:
12:35:27	LOAD DATA INFILE 'D:\\MySQL\\fdef.txt' INTO TABLE test.datetimetest   FIELDS TERMINATED BY '\t'   LINES TERMINATED BY '\n'	Error Code: 1290. The MySQL server is running with the --secure-file-priv option so it cannot execute this statement	0.062 sec

CLI:
mysql> LOAD DATA INFILE 'D:\\MySQL\\fdef.txt' INTO TABLE test.datetimetest
    ->   FIELDS TERMINATED BY '\t'
    ->   LINES TERMINATED BY '\n';
ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement
mysql>

^^ If set to NULL, the server disables import and export operations.

- less secure - secure_file_priv=""

mysql> select @@secure_file_priv;
+--------------------+
| @@secure_file_priv |
+--------------------+
|                    |
+--------------------+
1 row in set (0.00 sec)

WB:

12:42:03	LOAD DATA INFILE 'D:\\MySQL\\fdef.txt' INTO TABLE test.datetimetest   FIELDS TERMINATED BY '\t'   LINES TERMINATED BY '\n'	1 row(s) affected Records: 1  Deleted: 0  Skipped: 0  Warnings: 0	0.156 sec

CLI:
mysql> LOAD DATA INFILE 'D:\\MySQL\\fdef.txt' INTO TABLE test.datetimetest  FIELDS TERMINATED BY '\t'  LINES TERMINATED
BY '\n';
Query OK, 1 row affected (0.15 sec)
Records: 1  Deleted: 0  Skipped: 0  Warnings: 0

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LOAD DATA INFILE 'C:/CDRS_Daily_2940_2019-06-24.csv' INTO TABLE aat_cdr24 FIELDS TERMINATED BY ',' LINES TERMINATED BY '\r\n';

I GET THIS ERROR LOAD DATA INFILE 'C:/CDRS_Daily_2940_2019-06-24.csv' INTO TABLE aat_cdr24 FIELDS TERMINATED BY ',' LINES TERMINATED BY '\r\n';

Bug #112122 marked as duplicate of this one.