In 4.18 i noticed in VR that sometimes when i move around inside totally shadowed areas, i will occasionally get full light on my hands or objeccts im holding. If i move the hands or item around in that area, it seems like it dissapear, but usally show up again in a different area shortly after. I will post a video showing what i mean and my light setup later. But if someone else has seen this behavior, please comment.
Edit: Added a small animated gif that i recorded yesterday: Screen capture - dd31661625df56fd56d2b573d7253377 - Gyazo