System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits) VMware, Inc. 3.3 (Core Profile) Mesa 11.2.0 (git-aa91c51)

Blender Version
Broken: version: 2.83.3, branch: master, commit date: 2020-07-22 06:01, hash: rB353e5bd7493e
Worked: (newest version of Blender that worked as expected)

Short description of error
By assigning a texture color on a face, it doesn´t fill the face with the color but rather makes it TRANSPARENT.

Exact steps for others to reproduce the error
At first I entered the edit mode. Then I clicked on material preview right on the top and on material properties below. when I selected one or more faces to make a new texture for it or them, I presseed "Assign" to assign their color, but instead of assigning the real color, it makes every or in rare cases the most part of the faces TRANSPARENT.