FXAA fires in a straight line

Yeah, heli streamers are using this bug but not many people are talking about it and I've even been told in game that its an intentional thing by pilots (when there are no such patch notes to indicate it is intentional).

The bug been something like: FXM-33 missiles will lock on and fire but if the target dips below radar it will fly straight past the pilot (they won't get the incoming missile indicator either from what I've seen). In other words, going below radar is acting like flares (at least for FXM-33 vs nightbird, not sure about other air vehicles).

Edit: I'd also add that in the instance it happened to me it was happening 100% of the time -- I fired all 3 of my missiles but the nightbird (<100m away) was able to keep dipping under radar to avoid getting hit.