Task is kill 2 player bombers in t3 or above plane.
I’m in a br5-6 EC match and killed 2 player bombers. Flying F4U-4B, killed a pe8 and a ju-288.
Battlepass task didn’t update, still reads 0/2 kills.
Edit:
Battlepass registered the kills after match ended. I’m guessing it tallies your kills at rewards screen rather than per useful action thingy.