Is this a bug or have I forgot a rule?

[UP844]

While playing Rico's "Biazza Ridge", I had a C leader (#8) and two Airborne squads (#4 and #6) in hex 14,27.

The AI sent a first stack in an adjacent hex (15,27), and I fired two First Fires and two Subsequent Fires, using the leader(*) and a squad each time.

Then the AI sent a second stack in the same hex (15,27). I intended to fire two 1-squad Final Protective Fires, but when I fired the first time (with the leader and the #6 squad), both squads checked morale.

Which of these two options is correct?

1) when one or more units performs FPF all units take a MC even if they did not fire in FPF
2) when one or more units performs FPF only the units performing FPF must take a MC

If the first is true, I forgot a rule. But if the second is true, this is a bug requiring attention.

[UP844]

The manual (point 9.3) states what follows:

Final Fire:
A Personnel unit marked with Final Fire marker can only fire into adjacent hex; in addition the personnel unit marked with Final Fire marker has to perform morale check. If the personnel unit fails its morale check, it breaks (broken+ state).


Has the non-firing squad performed (and failed) a MC because it was also marked with a Final Fire marker even though it had not (yet) performed FPF?