Random sections of Terrain were flashing in editor, after starting a session the flashing was fixed but multiple random terrain subsections lost all collision.
Unreal Editor for Fortnite
Live Edit
N/A | Issue just happened out of nowhere.
Terrain should remain solid and not flicker in editor.
Terrain sections become intangible.
windows
just noticed it too in-game. Near the river edges I just fall straight through the map 
While playing a game that is published but unlisted i can also confirm this happened to myself while in a truck. I was driving up a slight incline (Near a water edge) and the truck just went straight through and i was under the map in the truck. I couldn’t repro it in the same spot for some reason so i don’t know what’s happening but yea just wanted to confirm this happened for the first time ever yesterday on a published version
Ooh I’ve had the flickering terrain, stopped the flickering by a hydro tool click on the landscape tile.
It also fixes the collision for the landscape sculpt and paint tools.
Haven’t been testing for terrain integrity though…now I’m a little bit worried.
Now that’s just insane! Hope they fix this real soon
So i think i found my issue which is indeed a bug imo
I have an underground volume in a certain area as the player can go under the map now as the volume was pretty bug it went into the area that you could go through with the truck. Now that area the truck went through has no cut outs ect so it should be constant solid with collision even if there is an underground volume going through it or thats how i think it should work.
I have changed the size of the volume and o far in a session i cannot glitch under the map so i will publish and do more tests but i think that was the cause of my issue.
I believe regardless of having an underground volume it should not disable collision on a landscape piece. As far as i know you have to cut the landscape so it has a hole then the underground volume only ensures the player will not get eliminated but i think in my case the underground volume is actually negatively impacting landscape collisions