ID 227116 - Projection artifacts are created when LensDistortion node is used in this script

Problem summary
LensDistortion node generates projected artifacts in alpha channel.

Customer reported version
nuke.10.0v1

Customer reported platform
fedora

Steps to reproduce

1) Open the attached Nuke Script (Nuke9_LensDistortionProjectionArtifact_TEST.nk)

2)  View alpha channel

3) Place frame indicator around frame 1130

4) Artifacts appear in the lower left side corner

Reproduced by support
Reproduced by support. Nuke 8.0v6 to 10.0v1 (Windows 7)

Expected behaviour
No artifacts in any channel

Actual behaviour

Artifacts appear in the lower left side corner when alpha channel is enabled