ID 459859 - Half Float ACES Linear IPP2 colorspace incorrectly applied in Nuke Studio

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Problem summary
Within Nuke Studio 12.2v1 releases and later, it is possible to alter the R3D IPP2 colorspaces within the Read node itself using the IPP2 Custom selection, through the Primary drop down.

If the Half Float ACES Linear colorspace is selected in Nuke Studio, the applied colorspace will be incorrect in comparison to the correct result within Nuke.

Note: The Nuke colorspace has been confirmed to be correct.

Customer reported version
nuke.12.2v3

Customer reported platform
centos7

Steps to reproduce

1) Open a new Nuke Studio 12.2 session

2) Within the Project Settings, under the Color Management tab, select ACES_1.1 (ensuring OCIO is set)

3) Import R3D footage

4) Double-click on the clip to open it's Read properties 

5) From the Image Pipeline drop down, select IPP2 Custom

6) Select the Primary drop down, and change the Color Space to Half Float ACES Linear

7) View the result in the Viewer

8) Repeat the above steps in Nuke 12.2 and compare results
Result: Nuke Studio's integration of the Half Float ACES Linear colorspace is incorrect.

Expected behaviour
Nuke Studio's Half Float ACES Linear colorspace should match the correct Nuke colorspace

Actual behaviour
Nuke Studio's Half Float ACES Linear colorspace does not match the correct Nuke colorspace

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Nuke Studio 12.2v3 - Windows 10, MacOS 10.15.6, CentOS7
Nuke Studio 12.2v1 - Windows 10, MacOS 10.15.6, CentOS7

Unable to reproduce bug in:
Nuke Studio 12.1v5 - Windows 10, MacOS 10.15.6, CentOS7

Earliest version tested
Nuke Studio 12.1v5
- The ability to alter IPP2 profiles (through IPP2 Custom) was introduced in Nuke Studio 12.2
 

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