System Information
Operating system: Linux-5.9.16-200.fc33.x86_64-x86_64-with-fedora-33-Thirty_Three 64 Bits
Graphics card: AMD JUNIPER (DRM 2.50.0 / 5.9.16-200.fc33.x86_64, LLVM 11.0.0) X.Org 3.3 (Core Profile) Mesa 20.2.6

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2021-01-06 23:54, hash: rBa9c607e60ebf
Worked: (newest version of Blender that worked as expected)

Short description of error
Wireframe input node incorrectly shows triangles where there should be none...

Exact steps for others to reproduce the error
When using a Wireframe input node in the shader, it will show triangles there were there are non, but quads and / or n-gons. How to get here: Set your "Blender Viewport" to "Rendered" view, create a default cube, move it to X, Y, Z = 0, 2, 0, leave its material to the default Blender material. Create another default cube, leave that at its origin and create a new material with it selected, move into the "Shader Editor" and replace the default "Principled BDSF" shader with a "Wireframe input node" one.

The second cube is showing triangles where it has none, they should be quads, or am I grievely mistaken...?