External lights only render on Right eye + Random ghosting image on Right eye only

I don’t believe I have a solve for your question, but related to it, here are 2 topics about this you might want to check out to see if you agree with:

[BUG] Shader code ‘viewdir’ and shadow/light rendering are inconsistent on right eye

Airliner exterior lighting bug - Bugs & Issues / Virtual Reality (VR) - Microsoft Flight Simulator Forums