Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX TITAN X/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 382.05
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-15 16:32, hash: rBeba4a4bd73ba
Short description of error
Camera pixel size is not correctly exported. It is important to set the camera size in the correct aspect ratio and lens for VR exporting (unity/ Snapchat Lens Studio).
Exact steps for others to reproduce the error
In an empty scene in Blender, select a camera.
Go to size properties: common size: 1920x1080 and 35 mm lens camera. Switch it to 1080x1920 (vertical camera) and a 50mm lens.
The result is still 1920x1080 and 35 mm lens. (1.778 aspect ratio) on Unity or Lens Studio.