ID 355791 - Specific ZDefocus knob values cause Pixel extension on footage

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Problem summary
When using the ZDefocus node, if specific values are set, the Viewer results in an unintended pixel extension.

Customer reported version
nuke.11.1v3

Customer reported platform
centos7

Steps to reproduce

1) Open the attached Nuke Project.

2) Set the read node to the attached EXR file

3) Set the Viewer to the ZDefocus node

Result: There is a pixel extension around the ZDefocus:



Workaround
Editing the size knob values by an offset of atleast 0.01 sets the ZDefocus back to its expected behavior
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Reproduced by Support in:
Nuke 13.0v1 - Windows 10, macOS 10.14, CentOS 7
Nuke 12.0v1 - Windows 10
Nuke 11.0v1 - Windows 10
Nuke 10.0v1 - Windows 10
Nuke 9.0v1 - Windows 10
Nuke 8.0v1 - Windows 10 - Mac10.14 - CentOS 7

Earliest version tested
Nuke 8.0v1 - This issue appears to be in all versions of the product.

Expected behavior
There should be no pixel extension created on the ZDefocus node

Actual behavior
A pixel extension is created when the ZDefocus is set to specific values.
 

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