ID 421318 - Hiero/Nuke Studio Viewer displays unexpected images when disabling items when Transitions and Burn-Ins are applied

Problem summary
Hiero/Nuke Studio Viewer displays unexpected images when disabling items when Transitions and Burn-Ins are applied

Customer reported version
hiero.12.0v3

Customer reported platform

Centos7.7

Steps to reproduce

1) Open Hiero/Nuke Studio

2) Import a QuickTime file (This has also been reproducible with .DPX)

3) Add it to the timeline

4) Spilt the clip into four sections, and move two of the clips to a new track

5) Add transitions between the clips on each track

6) Create a new track and add burnin gizmo

7) Disable and enable the clips/burn-in, the Viewer will temporarily show incorrect images

Expected behaviour
For the clips images to be show correctly

Actual behaviour
When disabling items, the image would appear inverted/blown out/black or sometimes the burn-in would have the incorrect format:

Workaround
If you mouse over the Viewer, the image returns to normal

Reproduced by support

This bug has been reproduced in:
Nuke Studio 12.0v3 - Windows 10 - CentOS 7.7 - MacOSX 10.13

Nuke Studio 12.0v1 - Windows 10 - CentOS 7.7 - MacOSX 10.13 - Windows and Linux regression

Nuke Studio 11.3v6 - MacOSX 10.13*

Nuke Studio 11.3v1 - MacOSX 10.13* - Mac regression

Unable to reproduce bug in:

Nuke Studio 11.3v6 - Windows 10 - CentOS 7.7

Nuke Studio 11.2v5 - MacOSX 10.13

*Its harder to see on these Nuke Studio versions, and produces a different inverted colour than 12. While pressing and holding D to toggle disabling the track eventually shows it

On Linux, the incorrect image is only shown for a split second, then Viewer the redraws, on Mac and Windows, the image persists

Earliest version tested
Nuke 11.2v5 - This issue doesn't appear in this version and has regressed