Created attachment 139995 [details]
file showing color picker+acs red bug

SUMMARY
Middle panel of Advanced Color Selector does not update when color-picking pure reds (red channel only, no green or blue).

STEPS TO REPRODUCE
1. open attached file, or make a several patches of pure reds with a flat+no texture+100% opaque brush (any value)  and a few other colors for comparison.
2. select any of the non red colors (labelled 'ok' in file) using the color picker tool or shortcut.
3. attempt to color pick one of the pure reds(labelled 'not ok' in file).

OBSERVED RESULT
The Center panel of the Advanced Color Selector remains at the same hue as the previously selected color (and does not update to red) - the value and saturation, and the position of the marker on the hue-wheel seem to update correctly.

EXPECTED RESULT
Expected the color of the Advanced Color Selector to update to reflect the color I just selected.

SOFTWARE/OS VERSIONS
Windows: 

Krita
  Version: 4.4.5

Qt
  Version (compiled): 5.12.9
  Version (loaded): 5.12.9

OS Information
  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 6.1.7601
  Pretty Productname: Windows 7 SP 1 (6.1)
  Product Type: windows
  Product Version: 7sp1


OpenGL Info
 
  Vendor:  "Google Inc." 
  Renderer:  "ANGLE (NVIDIA GeForce GTX 660   Direct3D11 vs_5_0 ps_5_0)" 
  Version:  "OpenGL ES 3.0 (ANGLE 2.1.0.57ea533f79a7)" 
  Shading language:  "OpenGL ES GLSL ES 3.00 (ANGLE 2.1.0.57ea533f79a7)" 
  Requested format:  QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(DeprecatedFunctions), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior QSurfaceFormat::DoubleBuffer, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::CompatibilityProfile) 
  Current format:    QSurfaceFormat(version 3.0, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize 24, redBufferSize 8, greenBufferSize 8, blueBufferSize 8, alphaBufferSize 8, stencilBufferSize 8, samples 0, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 0, colorSpace QSurfaceFormat::DefaultColorSpace, profile  QSurfaceFormat::NoProfile) 
     Version: 3.0
     Supports deprecated functions false 
     is OpenGL ES: true 

QPA OpenGL Detection Info 
  supportsDesktopGL: true 
  supportsAngleD3D11: true 
  isQtPreferAngle: true 

Hardware Information
 Memory: 7 Gb
 Cores: 4

ADDITIONAL INFORMATION
Tested for similar behavior briefly with specific color selector, small color selector, and the plugin pigment.io. Seems to be no problem with them. 
Also apologise that this is somewhat a duplicate of 434268 but decided to post anyway as the poster for 434268 was apparently unable to reproduce the bug.