Always when i animating some paramenetrs (possition, material opacity scale paramenet, etc.) UE trying to lerp values between 2 keyframes, but when i dont need to lerp it, UE stiil going to lerp, even i place support keyframes. Example on screenshot: I need to animate opacity from 0.4 to 0, its good. but when i need a 0.4 again after some time, beetween these keyframes UE lerp goin to negative (red lines), and even i place more support key frames with 0 valuse (blue lines), opacity still goin to lerp, just closer to right keyframe. Ofcourse i can just on and off object, but this bug works with position of objects and more. As i remember at UE 4.13 and 14 there is no bug.