The MSP430 driverlib code supports both 8-bit (P1,2,3,...) and 16-bit (PA,B,C,...) ports, and takes care to adjust the 'odd' 8-bit register values to work with the 16-bit accesses. The MSP432 driverlib code is written so that it works only for 16-bit ports, but documents only the 8-bit ports. The examples use 8-bit ports, too, so this looks like a bug in the code.
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