Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86
Broken: 2.80, 2.79
Short description of error
Exact steps for others to reproduce the error
Make flat loop, that not oriented in global/local XYZ normals
Enable face normals overlay
Select normal orientation and Gizmo to see orientation
Select loop. Create face F. Now you see the difference as on screenshot (gizmo saves old rotation).
Is it bug or very specific calculation of unuseful orientation?
Now I am forced to create faces, to have ability to squish loops on their X