Suddenly this started appearing in my projects (not only this one but another one too) - it appears in game too. Only appears when Lit. This is originating from 0,0,0 world origin.
more become visible with my post process enabled but they could have been visible the whole time just hard to see, not sure.
Found the issue. It’s Lumen’s Global Illumination. I disabled it under Show->Lighting Components and the lines went away. Same issue as this? [BUG] Weird color error after upgrading - Platform & Builds - Unreal Engine Forums
