d66e3f899a
The CPU compositor does not recognize viewer groups inside node groups unless a viewer node exists at the top level node group. This is caused by bad logic when registering viewer node at the node operation builder. And the fix is just to correct the logic to always register viewers if no active viewer already exists, which can then later be overwritten if a viewer node that takes precedence was discovered. Pull Request: https://projects.blender.org/blender/blender/pulls/122869
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