ID 393519 - Artefacts appear when using DeepHoldout operations on multi-sample deep images

Problem summary
Artefacts appear when using DeepHoldout operations on multi-sample deep images

Customer reported version
nuke.11.3v4

Customer reported platform
centos7

Steps to reproduce

1) Open the attached Nuke script

2) Notice the incorrect line that appears in the Viewer

The above image shows the artefact, the below image shows the fixed frame.

Expected behaviour
For there to be no artefacts when rendering

Actual behaviour
A line artefact appears

Workaround
Increasing the samples in the MultiSample tab of the ScanlineRender node seems to prevent the issue.

Also disabling the Deoverlap knob in the DeepColorCorrect node seems to stop the artifacting, however changes the image's colour

Reproduced by support

This problem has been reproduced on:

Nuke 11.3v4 - Windows 10 - CentOS 6.9 - MacOSX 10.13 - regression

Nuke 11.2v6 - Windows 10 - CentOS 6.9 - MacOSX 10.13 - regression

Unable to reproduce in:

Nuke 11.3v3 - Windows 10 - CentOS 6.9 - MacOSX 10.13

Nuke 11.2v5 - Windows 10 - CentOS 6.9 - MacOSX 10.13

Earliest version tested
Nuke 11.2v5 - This issue no longer appears in this version and has regressed