TestImagePSB fails

[devernay]

In https://github.com/NatronGitHub/Natron-Tests/tree/master/TestImagePSB

If I convert the PSB to EXR with OIIO, I can read the two subimages:
oiiotool input.psb -o oiio.exr

However, when reading the image directly with ReadOIIO in Natron, the two layers seem identical.

Natron v2.3.16 macOS