The Cryptomatte node considers preview channels as part of the
Cryptomatte layers, producing bad pick outputs at best and bad mattes at
worst.
The Cryptomatte specification specifies that a layer with the same name
as the typename is a (Now deprecated) preview layer, so it should be
ignored, which is what the patch does.
Pull Request: https://projects.blender.org/blender/blender/pulls/115879
45dcc61fd2