Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 610 Intel 4.5.0 - Build 26.20.100.7263
Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-18 16:26, hash: rBb8601b64c7cb
Worked: (newest version of Blender that worked as expected)
Short description of error
When I use the graphics engine workbench> Material properties> View port Display.
I choose a dark color to use as a transparency mask when the alpha value is: 1,000. It correctly displays the preview but when I just changed the example value 0.990 the render shows as if the value was the minimum. And when lowering the value to 0.000 the mask should be totally transparent but the render shows me as if it had a value between 0.300 to 0.500
Exact steps for others to reproduce the error
Open file and render image
