ID 588255 - Changing the Viewer's downrez can also change the result of SphericalTransform nodes

Problem summary
Changing the Viewer's downrez can also change the result of SphericalTransform nodes.

The issue also happens when writing out proxy images as well.
 
Customer reported version
Nuke 14.0v2
 
Customer reported platform
Windows 10
 
Steps to reproduce
 
1) Open Nuke.
 
2) Create a CheckerBoard.
 
3) Downstream of the CheckerBoard, create a Spherical Transform node.
 
4) Change the Output Projection knob to Fisheye. Set both Shift x and y to 1.
 

 
5) Note the result in the Viewer, when downrez is set to 1:1.

 
6) Change the downrez setting to 1:2 and notice that the image in the Viewer looks completely different:
 

 
Expected behaviour
downrez should scale down the image, without changing the result.
 
Actual behaviour
Changing the downrez also changes the final result of the SphericalTransform.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Nuke 15.1v3 - Windows 11 - macOS 12
Nuke 12.0v1 - Windows 11 - macOS 12
 
Earliest version tested
Nuke 12.0v1
- This issue appears to be in all tested versions of the product. In Nuke 12.0v1, the issue happens with both SphericalTransform and C_SphericalTransform.