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Weird Pixel when using alpha in viewport display
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.13587 Core Profile Context 20.2.2 26.20.15019.19000

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8 2.91.0 / 2.92.0 Alpha
Worked: 2.90.0

Short description of error
Every time I use alpha in the viewport display I get a graphics bug. Its only in Solid View. Doesnt happen in small simple scenes afaik. Blender 2.90.0 works perfectly. 2.91.0 and higher doesnt work.
I discovered this while using the botaniq addon from Plygoniq. Some people with polygoniq addons have this issue. Looks like they use a lot of this alpha in viewport display thing. Some people say they have the same problem and some people say they have no problems. I think its an AMD problem. I saw one guy with the same problem with a RX 580 and I saw one guy with a 2070 without problems. I also tested it on a Intel i3 6100 without problems.

Exact steps for others to reproduce the error

  • Open the Junk Shop file ( or any other "complex" file is also ok I guess )
  • make sure you are in solid view
  • choose a object and go to the material properties
  • go to viewport display and change the alpha of the color to a value between 0 and 0.999