That's odd... I don't use Blender but here's what I got:

-In Zbrush, only body parts are recognized. When I had Zbrush hide the eye body parts, the entire eyes were hidden.

-In Cinema4d, I can select the polygons of groups, both material and body part groups. Selecting the body part groups for the eyes selected the entire eyes (I did check by hiding the selected polys), selecting the materials was hiding each material correctly.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.