This problem seems to have started yesterday. I didn’t change anything that’d be related to this.
My game has a map roughly 4096x4096 and uses StreamingEnabled. I started receiving a bunch of reports of the terrain being invisible for a split second in some places, and completely missing in others.
One player said it only happens at a certain camera angle, so my immediate thought is that it might be a culling issue. I reproduced it on my Windows computer running the normal Windows client (not UWP.) I haven’t heard about it happening on any other platform, but that’s not saying much with my game’s playerbase.
It definitely appears to just be visual, as raycasts are still hitting the collision mesh and you can still walk on it normally.