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Bug in color wheel when choose value of color.
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2021-01-04 23:35, hash: rB9b17e71c23a9
Worked: 2.91.0
Short description of error
Difference of value representation in color space using numbers and graphic slider in shader editor. When you switch to themes (user preferences) all is right.

Exact steps for others to reproduce the error

  1. Create new material to default cube.
  2. Switch to shader editor.
  3. Click on base color.
  4. Go to HSV mode.
  5. Type value 0,5 and notice that vertical slider isn't in a half way.

  1. Repeat the same steps in 2.91.0 and see that all is OK.

Event Timeline

Since commit rBf193b1afb313bcb937a396f09da2b9903a0d2fc3 the sliders in HSV mode have their values in scene linear instead of sRGB. The displayed value gradient remains sRGB (see this answer on Stack Exchange why the dot isn't at 0.5).