Was getting this issue when using DitherTemporalAA function in a masked material in 5.0.3 on a skeletal mesh; the material was flickering and having black noise all over it which when closely inspected you could make out “your scene contains a skydome mesh with a sky material but it does not cover that part of the screen” for me i managed to work out the following setting was my issue after a few hours “r.EarlyZPassOnlyMaterialMasking” in DefaultEngine.ini (or the equivalent in project settings) i changed this to 0 and it fixed my issue although not sure why i’d turned it on lol probably will reintroduce a bug i fixed years ago but that’ll be more fun for another day