From my testing, the issue is only in this build and the previous one, not the 9/19 build nor the ones before it.
That should help (at least it narrows it down to a build), I'll go through the code and commit history to see if I can find out what's going on.
Update: after studying the commits, I think I might've found what might've broken it, I just now need to find the bug itself. Basically for the VR support, instead of having 1 camera in Skyscraper, I made an array of cameras, in VR mode it uses 2 cameras. That's the only thing that touched the engine context code in the last two builds.