ID 505674 - Loading soft effects into Viewer buffers don't work correctly

Problem summary
Loading soft effects into Viewer buffers don't work correctly
This happens when trying to load a clip directly in by itself. with another clip item, of the video track by itself
 
Customer reported version
nuke.13.1v3
 
Customer reported platform
 
Steps to reproduce
 
1) Open Nuke Studio

2) Import some footage and add it to the timeline

3) Create a second track, then right click the track head > Soft Effects > Text
 
4) Add some text to the Text Soft Effect so you can easily see it
 
5a) Select the soft effect and the clip below, then press 1, only the clip is displayed:

 
5b) Select just the clip and press 1, no playhead indicator appears and the viewer is black:
 

 
5c) Select the Soft Effect Track head and press 1, the playhead indicator appears however the Viewer is black:
 

 
Expected behaviour
For the Soft Effect to be rendered and the playhead indicator to always appear
 
Actual behaviour
The Soft Effect is not rendered, and for soft effects which are self generating, like the Text Soft effect, they appear black when isolated.
 
Workaround
If you select both video track heads then press 1, it will have both playhead indicator and the images will render correctly, but this doesn't help for all cases:
 

 
Reproduced by support
This bug has been reproduced in:
Nuke Studio 13.1v3 - Windows 10, CentOS 7 *Playhead indicators were only added in 13.1
Nuke Studio 12.0v1 - Windows 10
Nuke Studio 9.0v1 - Windows 10
 
Earliest version tested
Nuke Studio 9.0v1 - This issue appears to be in all versions of the product