System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: Quadro FX 4800/PCIe/SSE2 NVIDIA Corporation 3.3.0
Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: rB26bd5ebd42e3
Worked: (optional)
Short description of error
Drawing error with multi-material object. Faces dissapear or showing artefacts with 2 or more material slots applyed to same object
Exact steps for others to reproduce the error
Select the face on the objetc and apply the second material slot

