ID 605821 - The alpha channel displays zero for super values above 10000 when viewing the luminance key operation of the Keyer node.

Problem summary
The alpha channel displays zero for super values above 10000 when viewing the luminance key operation of the Keyer node.
 
Customer reported version
Nuke 15.1v3
 
Customer reported platform
Ubuntu
 
Steps to reproduce
1) In Nuke, copy/paste the following script:

set cut_paste_input [stack 0] version 15.1 v3 push $cut_paste_input Ramp { p1 {1778 546} name Ramp1 selected true xpos 227 ypos -72 } Grade { white 100000 name Grade1 selected true xpos 227 ypos -46 } Keyer { operation "luminance key" name Keyer1 selected true xpos 227 }

 
2) View the Keyer node, then the alpha channel in the Viewer.
3) Press and hold CTRL then left-mouse click and drag over the edge of the white/black pixels, observing alpha channel values.
 
Expected behavior
The alpha channel should accurately display the intended value with supers above 10000.
 
Actual behavior
The alpha channel value becomes 0 at any pixel value above 10000.
 
Workaround
Increase the range sliders of the Keyer knobs (C and D) to be above the value of the input pixels.
 
Reproduced by Support in:
Nuke 16.0v4 - Windows 10/11, macOS 14
Nuke 14.0v1 - Windows 10/11, macOS 14
 
Earliest version tested
Nuke 14.0v1 - This issue appears to be in all tested versions of the product