Assist and Kills are broken

Crit a plane who then crashed into ground - didnt even got assist, no one even got the kill
hit someone once with MG who then also crashed into ground and i got the kill

other match i crit a heli who then got destroyed by someone else and i didnt even got an assist

a lot of times this is happening, is this intentional mechanic to slow down progression? whenever this happens in arcade or realistic i will one death leave now