raster product type renders an EXR that loads into Nuke with an RGBA layer instead of the expected rgba layer

[xsisupport]

Describe the bug
When you render with the raster product type, Nuke loads the beauty into RGBA instead of rgba. So by default, in Nuke, you end up looking at an all-black render, because the beauty is not in rgba, it's in RGBA.

An EXR rendered with the arnold product type loads correctly into Nuke (as does an EXR rendered with Karma).

For raster, the channel list (listed with oiiotool) is

channel list: RGBA.R, RGBA.G, RGBA.B, RGBA.A

Arnold product type, and Karma, output R, G, B, A

To Reproduce
Steps to reproduce the behavior:

1. Render with Arnold and the raster product type.
2. Load the EXR into Nuke
3. rgba is empty (all black)

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Used Software Versions

• HtoA 6.3.4
• I think it's always been like this

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-15522