Operating system: Linux-5.4.18-1-MANJARO-x86_64-with-glibc2.2.5 64 Bits
Graphics card: AMD VERDE (DRM 2.50.0, 5.4.18-1-MANJARO, LLVM 9.0.1) X.Org 4.5 (Core Profile) Mesa 19.3.4
Broken: 2.83 (sub 4), branch: master, commit date: 2020-02-18 17:20, hash: rB56d6666689f7 (bug introduced by https://developer.blender.org/rB56d6666689f7027126e8c115d01564810d1ae1bb)
(also broken: version: 2.83 (sub 4), branch: master, commit date: 2020-02-19 23:13, hash: rB0c01ad93004d)
(also broken: version: 2.83 (sub 4), branch: master, commit date: 2020-02-20 17:34, hash: rBa9b184bbc464)
(also broken: buildbot blender-2.83-ee7f307c9a11-linux64)
Worked: 2.83 (sub 4), branch: master, commit date: 2020-02-18 17:14, hash: rB20605c4b515e (last working rev)
Short description of error
Some faces are black, some are missing, new weird faces are added when entering edit mode from certain camera angles or they are already there when opening the file (like with the Spring scene). Switching between Object mode and Edit mode makes them disappear sometimes, but not for long.
It could be related to https://developer.blender.org/T74019 but it was not fixed by the fix.
New faces also visible in Spring splash scene (https://cloud.blender.org/p/gallery/5d2607ee6b3001d49bab798a) :
Those are not 2D artifacts but 3D geometry
Exact steps for others to reproduce the error
This does not happen with every mesh. It seems to be connected to ngon placement, but I cant exactly place my finger on it. Suzanne for example works fine.
in 2.81a and in 2.83 dev. In 2.83 alpha, enter edit mode, move the camera, toggle in and out of edit mode - sometimes the mesh is changed by that.