[Grbl_Esp32 Issue#1466] Control Switch interrupts not working on certain pins

This is more likely an issue with esp32 rather than grbl esp but I’ll ask just in case this isn’t the case

If I wire my control switches to the following pins everything works as expected:

“
#define CONTROLCYCLESTARTPIN GPIONUM_18 //WORKS
#define CONTROLRESETPIN GPIONUM23 //WORKS
`

Wiring my switches to the following pins does not execute the interrupts. I've confirmed the internal pull ups are enabled using a volt meter and that it is pulled to ground when the switch is pressed

`
#define CONTROLCYCLESTARTPIN GPIONUM_26 //interrupt not called
#define CONTROLRESETPIN GPIONUM27 //interrupt not called
`
GPIO_5 also does not generate the ISR

Using these pins, the interrupts are not run I've confirmed the interrupt isn't being called by putting a debug message in-
`
void IRAMATTR isrcontrol_inputs() {
grblmsgsendf(CLIENT_SERIAL, MsgLevel::Info, "isr called"); //not called for GPIO 26,27 and 5
`
Is there any reason why this might be the case ? I've disabled SD card (`//#define ENABLESDCARD“) as I know some of those pins may conflict. So I cant think of any other reason for this behavior. I’m using an MKS DLC32 v2.1 board with the LCD disabled so only have a certain number of pins available.

Any ideas ? All help appreciated, thanks.