ID 496687 - Color soft effects get applied to all channels/layers in the timeline, but only get applied to RGB channels on export

Problem summary
Color soft effects get applied to all channels/layers in the timeline, but only get applied to RGB channels on export

Customer reported version
nuke.n/a

Customer reported platform

Steps to reproduce

1) Open Nuke Studio/Hiero

2) Import the attached multi-layer exr and add it to the timeline

3) Add a Grade Soft Effect and give it an extreme grade

4) In the Viewer switch to the di_matte_01 layer, the Grade soft effect will also be applied there

5) Right click the clip>Export...

6) In the Export dialog, Process as Shots, use the Transcode Shots DPX preset, then change the file type to .exr and export the clip.

7) Import the rendered clip, and compare the results. The rgba layer will match the viewer, the di_matte_01 will not:

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Expected behaviour
For the colors to match

Actual behaviour
The timeline Viewer is adjusted by the soft effect for all layers, during export only the RGB layer is affected

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Nuke Studio 13.1v1 - Windows 10, CentOS 7
Nuke Studio 12.0v1 - Windows 10, CentOS 7

Earliest version tested
Nuke Studio 12.0v1 - could not apply soft effects on export in Nuke Studio 9.0v9