These, at random.Code:IOC_COM1_Swap_flag var IOCAF.4 IOC_COM2_Swap_flag var IOCCF.1 IOC_NAV1_Swap_flag var IOCBF.5 IOC_NAV2_Swap_flag var IOCBF.2
Only IOC was used, no other peripherals used on these pins.
I tried external pull-ups just now, in case the internal were just borderline, but that didn't make a difference.
EDIT: Using this wiring:
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