with 4.8 i am having random artifacts all over my tilemap. In general i see tiles disappear in my viewport whenever i change zoom level and sometimes if i deselect little eye in one of my layers and reactivate it they don’t show up at all or a small percentage of them re appears.
Here we see my tiles layer as it should be. And here we have same layer activated but it only shows a fraction of my tiles.
Now for even weirder part.It seems that Unreal adds artifacts to an existing tile from a completely different sprite. Here we see a green line(from my grass) that nests inside my dark rock tileset.
tile isolated.
If i zoom in artifact is gone.
Needless to say that my sprite does not have artifact and nothing like was happening before 4.8 . It seems that system adds random artifacts all over place. My tilemap was imported as a from texture packer and yes dark tile neighbors next to green one and that makes me speculate that has something to do with padding. Did you change anything that could affect coordinates of each sprite regarding original texture?
Dropbox - Error ( above pictures)