ID 516353 - The Viewer turns black when switching between tracks in the Viewer input buffer

Problem summary
The Viewer turns black when switching between tracks in the Viewer input buffer.
 
Customer reported version
Hiero 13.2v2
 
Customer reported platform
Linux
 
Steps to reproduce
 
1) Open Nuke Studio.
 
2) Import (File > Import File(s)...) two 4K clips. An example project is also attached. 
 
3) Drop both clips on to the timeline, in separate tracks, one above the other.
 
4) Set the sequence's Output Resolution to UHD_4K.
 
5) Set the Viewer proxy resolution to 1:1.
 
6) Switch between different tracks in the Viewer input buffer.
 

 
Expected behaviour
When switching between tracks in the Viewer input buffer, the image should be updated.
 
Actual behaviour
The Viewer turns black when switching between tracks in the Viewer input buffer.
 
Workaround
Clicking on the Viewer seems to force the Viewer to update.
 
Reproduced by support
This bug has been reproduced in:
Nuke Studio 13.2v3 - Windows 10 - Linux
Nuke Studio 12.0v1 - Windows 10 - Linux - Regression
 
Unable to reproduce bug in:
Nuke Studio 11.3v6 - Windows 10 - Linux
 
Earliest version tested
Nuke Studio 11.3v6 
- This issue doesn't appear in this version and has regressed