If interrupt attached to 2 or more pins of a port, detachInterrupt() doesn't work correctly

Here's the problem code in WInterrupts.c - note PIOB/C/D handlers have the same problem:

void PIOA_Handler(void) {
uint32_t isr = PIOA->PIO_ISR; // this line should be: uint32_t isr = PIOA->PIO_ISR & PIOA->PIO_IMR;
uint8_t leading_zeros;
while((leading_zeros=__CLZ(isr))<32)
{
uint8_t pin=32-leading_zeros-1;
if(callbacksPioA[pin]) callbacksPioA[pin]();
isr=isr&(~(1<

Start in WInterrupts.c with PIOA_Handler and compare the PIOB, PIOC, and PIOD handlers, which the issue says have the same problem. Check how PIO_ISR, PIO_IMR, and callbacksPioA[] are used; done means detaching one interrupt no longer invokes its callback while other attached pins on the same port continue to work.

Written by the indexing model from the issue text.