Shaders for night vision goggles in first-person are broken

The night vision goggles are supposed to have unique shaders when used in first person on a Blockster.
Last released build:
(Note, the vignette effect and sky are black ingame, but transparent when screenshotted.)
Current alpha build:
(It appears that the sky is transparent ingame.)

Start by reproducing the first-person night vision goggles behavior in the released build and current alpha, comparing the screenshots and in-game rendering described here. Trace the goggles' first-person shader and rendering path; done means the vignette and sky render correctly in-game rather than appearing black or transparent.

Written by the indexing model from the issue text.