Cryptomatte passes don’t seem to render correctly in Octane Blender 2018.1 / 17.6. When I bring the files into After Effects, the Cryptomatte plug in doesn’t detect them.
However, if I take the same Octane Blender file and export scene to ORBX and render in stand alone, the Cryptomatte passes show up fine. See attached screen shots.
Attached is blend file, ORBX export, and rendered EXR files.