hello,
in packaged game(development and shipping) sometimes we have this green light/render issue.
we are using the truesky plugin(4.21.0_4.1a.333_x64) in this UE4.21 VR project.
after 20 sec this bug starts to become less and less, so it feels like a exposure thing, but the exposure is fixed via post process.
testet on different machines (1080TI/2080TI and different drivers)
i am not sure if its related to this Pubg & Fortnite green flickering lines fix! (no driver rollback) - YouTube