ID 521770 - Overscan pixels from the Project3D node are cropped, unless proxy mode is enabled

Problem summary
Overscan pixels from the Project3D node are cropped, unless proxy mode is enabled.
 
Customer reported version
Nuke 13.0v7
 
Customer reported platform
Windows 10
 
Steps to reproduce
 
1) Open Nuke. Then open the attached .nk script, or follow the rest of the steps below.
 
2) Create a CheckerBoard.
 
3) Add a Transform downstream from the CheckerBoard. Set the Transform node's width scale to 20 (the bounding box should now be much larger than the format).
 
4) Create a ColorBars node.
 
5) Add a Transform downstream from the ColorBars. Set this Transform node's width scale to 10.
 
6) Create a Merge node, connecting its B pipe to the ColorBars branch and the A pipe to the CheckerBoard branch.
 
7) Create a Project3D and connect its input to the Merge node. Ensure that its crop knob is disabled.
 
8) Create a Card and connect it to the Project3D.
 
9) Create a Camera and connect it to the Project3D node's cam input.
 
10) Move the so that the overscan will be visible.
 
11) Create a ScanlineRender node and connect it to the bottom of the tree.
 
12) Create a second Camera node and attach it to the ScanlineRender node's cam input. Move it in 3D space, so that the Card is visible.
The Node Graph should now look something like:
 

 
13) View the 2D output from the ScanlineRender node, and toggle proxy mode on and off in the Viewer:
 

 
14) The same issue can be seen when writing out a full res version of the image, as well as proxy version.
 
Expected behaviour
The final result should look identical when proxy mode is enabled or disabled.
 
Actual behaviour
Overscan pixels from the Project3D node are cropped, unless proxy mode is enabled.
 
Workaround
Unknown.
 
Reproduced by support
This bug has been reproduced in:
Nuke 13.2v4 - Windows 10 - Linux CentOS 7
Nuke 12.0v1 - Windows 10 - Linux CentOS 7
Nuke 9.0v1 - Windows 10
 
Earliest version tested
Nuke 9.0v1
- This issue appears to be in all tested versions of the product