ID 234252 - F_Regrain - Grain Colour Space knob will revert to default Cineon if the bounding box changes upstream

Problem summary
F_Regrain - Grain Colour Space knob will revert to default Cineon if the bounding box changes upstream

Customer reported version
Nuke 12.1v1

Customer reported platform

Windows 10

Steps to reproduce

1) From Nuke, create a Checkerboard node and a Noise node.

2) Create a F_Regrain node and attach the Checkerboard as the Source and Noise as Grain.

3) In the F_Regrain Properties bin, adjust settings for the grainColourspace knob to be Linear.

4) Make any adjustments to the Noise node and view the grainColourspace knob.

Expected behavior
The grainColourspace knob should remain the same value as previously set.

Actual behavior
The grainColourspace knob reverts back to Cineon when any adjustments are made to the grain input.

Workaround
There is no available workaround at this time.

Reproduced by Support in
Nuke 12.1v1 - Windows 10, CentOS 7, macOS 10.14

Nuke 12.0v1 - Windows 10

Nuke 11.2v1 - Windows 10

Nuke 11.1v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.5v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke  9.0v1  - Windows 10, CentOS 7, macOS 10.13

Earliest version tested
Nuke 9.0v1 - This issue appears to be in all versions of the product