Found a workaround. First of all, in SteamVR settings, I had my per-app video resolution set to 500% which was blowing up my computer and slowing things to a crawl. So I reset it to default. Second, after getting the gray void, I CTRL+Tab to exit VR mode which opens SteamVR home, then I CTRL+Tab again to close SteamVR home and return to FS2020 VR. This fixes the gray void! Note that if your CTRL+Tab isn’t responding, make sure to set focus to the FS2020 window by clicking on it.