GIC-400 multiple pending interrupts abnormality

If there are multiple SPIs pending, our GIC-400 acts seemingly abnormally.

Reading out GICC_IAR to acknowledge the pending interrupt leads to an invalid ID value which looks like OR-ed values from the simultaneously pending SPIs.

In my understanding, GICC_IAR should return ID of the one and only one which has the highest priority among multiple pending interrupts at all times.

How could this happen?

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