It's a limitation, object mask can not be used with a procedural.
Object mask is actually an aov_write_float shader added to the root of the shading tree, thus it would require to modify the shader network inside the procedural, which is rather complicated.
Thanks for the clarification, Peter!
When an Object Mask Tag is added to an Arnold Procedural, the object mask aov does not create any result. It seems as if it is a problem for the Object mask to work on an external file/object that is not in the scene?
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