System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.35

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-18 14:52, hash: rB38d4483c6a51
Worked: (optional)

Short description of error
Cutting large objects with the knife tool in edit mode leads to undesired / unpredictable topology

Exact steps for others to reproduce the error
Create a plane 100m (I'm an environment / level artist, so this is a pretty typical size)
Enter into edit mode
Activate the knife tool & cut any kind of a shape (preferably an ngon)
Observe strange triangulation / bad geometry

Create a plane 2m
Enter into edit mode
Activate the knife tool & cut the same shape
Ngon is correctly cut into the object.