Hi David,
Just as Mark have said, it is the KE06 reference manual error, KE06 each KBI module have 32 pin, so the KBI module allows up to 32 pins to act as additional interrupts sources.
From the interrupt vector assignments, we also can find it.

Wish it helps you!
If you still have question, please contact me!
Have a great day,
Jingjing
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