After the new update Appo has 0 stacks of operation knightfall, while his unique says he should get 3 stacks if the leader is Lord Vader and all allies are DC clone troopers
Ideas
I have the opposite issue. I have Appo's zeta for the era battle, but I don't have Lord Vader. I use Appo on my empire squad with Palp, Vader, Mara Jade, and Tarkin, and he gets 3 stacks of Operation Knightfall. Thus, Knightfall Trooper respawns whenever he dies, even though he shouldn't. This does not occur when he is amongst only fellow DSCTs. Add Darth Vader to the DSCTs, though, and he does have Operation Knightfall. Non-Empire allies disable his summon, which is intended. Thus, as stated above, the conditions for receiving Operation Knightfall seem to be inverted.