this is the system info generated by blender 2.81nafter loading factory settings
this is the rendered cube
Broken: 2.81 from oct 16 and before
The Eevee rendering shows a lot of missing pixels, some greyed out , some transparent. Workbench and Cycles don´t have the problem.
With brand new installed 2.81, first opening, selecting general, F12 to render: missing or grey displayed parts of the cube. Also happens with more complex models and also in 2.82 while it worked well in 2.8 .