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How does F28069 work if more than one source on one trip zone signal

I'm testing PWM trip zone featuer on F28069 controlStick. If I configure GPIO16 as TZ2, it works properly, i.e., the TZ_INT ISR was hit when GPIO16 is grounded momentarily. However, if I configured GPIO13 as TZ2 as well in addition to GPIO16 as TZ2, none of the GPIOs would cause trip zone response.

It seems that if more than one source is configured to the same TZx, none of them would work. Please clarify this behavior, and if possible, is it documented in any TRM?