Have you read this topic yet?
You can't just disable the AP and keep wifi client. You will have to disable wifi all together or make AP SSID hidden
@Zheng-Han I'm curious, is this actually hard-coded in the driver, or are you just talking about your WiFi-configuration tools not being to do this? If it's actually hard-coded in the driver.....
It's hard coded in the MediaTek driver
There is an opensource version of the wifi driver, however it's very buggy we haven't being able to get it working reliably